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CORSAIR EX400U SURVIVOR vs Sandisk Professional PRO-G40 SSD

A

Product A: CORSAIR

EX400U SURVIVOR

28 of 63 known

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B

Product B: Sandisk

Professional PRO-G40 SSD

30 of 63 known

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Every value links to where we found it.

Only differences

ACORSAIR EX400U SURVIVOR

BSandisk Professional PRO-G40 SSD

General

5 of 9 differ

Series

EX400U4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Blog compares the drive with the original EX400U and calls the Survivor the latest addition to the portable SSD lineup

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Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

CSSD-EX400US1TB, CSSD-EX400US2TB, CSSD-EX400US4TB1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026SKU CSSD-EX400US2TB on the 2TB page. The capacity selector offers 1 TB, 2 TB and 4 TB, each with its own page and SKU (CSSD-EX400US1TB, CSSD-EX400US4TB). The 1TB and 4TB pages showed Out Of Stock on 2026-10-15

SDPS31H-001T-GBC1D, SDPS31H-002T-GBC1D, SDPS31H-004T-GBC1D, SDPS31H-001T-GBCND, SDPS31H-002T-GBCND1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Worldwide SKU table: SDPS31H-001T-GBC1D, SDPS31H-002T-GBC1D and SDPS31H-004T-GBC1D. The 2022 launch part numbers SDPS31H-001T-GBCND and SDPS31H-002T-GBCND come from Tom's Hardware's spec table. The sheet also lists China SKUs ending ZBC1D, which are not stored

GTIN / EAN

Not available

619659209599, 619659209568, 6196592096121Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026UPC column for the worldwide SKUs: 6 19659 20959 9 (1TB), 6 19659 20956 8 (2TB) and 6 19659 20961 2 (4TB). Stored as 12-digit UPC. The sheet gives no GTINs for the GBCND launch parts

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

23 October 20255Press releasecorsair.com/newsroom/press-release/corsair-adds-rugged-performance-and-mobile-convenience-to-its-storage-portfolioRead 15 October 2026Press release dated 2025-10-23, announcing the EX400U SURVIVOR and the EX300U

5 October 20223Press releasewesterndigital.com/de-at/company/newsroom/press-releases/2022/2022-10-05-western-digital-turbocharges-versatility-with-new-sandisk-professional-pro-g40-ssdRead 15 October 2026Western Digital press release dated 2022-10-05, San Jose, California

Status

Available1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 20262TB page showed In Stock on 2026-10-155Press releasecorsair.com/newsroom/press-release/corsair-adds-rugged-performance-and-mobile-convenience-to-its-storage-portfolioRead 15 October 2026Available at launch. Corsair's store still lists the SKUs in 2026

Available2Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-professional-pro-g40-ssdRead 15 October 2026The page is live in October 2026 with the three GBC1D SKUs. Amazon US showed the 4TB at rank 51 in External Solid State Drives with 1,098 reviews

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

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SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

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Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$254.996Press articlegdm.or.jp/pressrelease/2025/1024/609408Read 15 October 2026Japanese reprint of Corsair's 2025-10-23 announcement lists the US direct-sale prices in USD at launch: 1TB 144.99, 2TB 254.99, 4TB 409.99. Excl. sales tax. IT Home reports the same three prices. No EUR launch price was found. Base value is the 2TB7Press articleithome.com/0/891/958.htmRead 15 October 2026Chinese report of the same announcement: 144.99 / 254.99 / 409.99 USD for the three capacities, with a five-year warranty

From $299.991Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 20263Press releasewesterndigital.com/de-at/company/newsroom/press-releases/2022/2022-10-05-western-digital-turbocharges-versatility-with-new-sandisk-professional-pro-g40-ssdRead 15 October 20264Press articlestoragereview.com/review/sandisk-professional-pro-g40-reviewRead 15 October 20265Press articlecomputerbase.de/2022-10/sandisk-professional-externe-pro-g40-ssd-ist-schnell-und-teuerRead 15 October 20266Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 20267Measurementtomshardware.com/reviews/sandisk-pro-g40-ssd-review/3Read 15 October 20268Measurementtomshardware.com/reviews/sandisk-pro-g40-ssd-review/2Read 15 October 2026

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

Not available

From €4711Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 20263Press releasewesterndigital.com/de-at/company/newsroom/press-releases/2022/2022-10-05-western-digital-turbocharges-versatility-with-new-sandisk-professional-pro-g40-ssdRead 15 October 20264Press articlestoragereview.com/review/sandisk-professional-pro-g40-reviewRead 15 October 20265Press articlecomputerbase.de/2022-10/sandisk-professional-externe-pro-g40-ssd-ist-schnell-und-teuerRead 15 October 20266Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 20267Measurementtomshardware.com/reviews/sandisk-pro-g40-ssd-review/3Read 15 October 20268Measurementtomshardware.com/reviews/sandisk-pro-g40-ssd-review/2Read 15 October 2026

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

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ColoursiThe maker's own colour names

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Black1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Color column reads Black for every SKU

Form factoriPhysical size of the drive. External is any drive in its own case that connects by cable. A drive sold in two M.2 lengths is two products. Xbox expansion card is a card for the storage expansion slot of an Xbox Series console.

External1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026

External1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Portable SSD in a rugged case that connects by a USB-C port, so stored as external

CapacityiNominal capacity before formatting, in decimal GB. A published 1 TB is 1000 GB. A published 1024GB stays 1024. The marketed capacity is stored, not a raw or usable figure from the same table, such as OWC's 2048 GB total and 1920 GB usable for a 2.0TB drive.

1 TB, 2 TB, 4 TB1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Capacity selector offers 1 TB, 2 TB and 4 TB

1 TB, 2 TB, 4 TB1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Capacity column: 1TB, 2TB and 4TB. Footnote: 1 TB = 1 trillion bytes

Interface

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InterfaceiFastest host connection the drive is rated for. The PCIe generation of an NVMe drive is its own field. A Thunderbolt drive that also works over USB uses its Thunderbolt version.

USB41Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Page says blazing-fast USB4 up to 40Gbps, USB4/Thunderbolt 4/iOS compatible and backwards compatible with USB 3.2 Type-C. Maximum performance needs a USB4 or higher connection. Stored as USB4, since Corsair does not call the drive a Thunderbolt device4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Table row Interface: USB4 Type-C, backward compatible with USB 3.2

Thunderbolt 31Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Interface row reads Thunderbolt 3 (40Gbps) and SuperSpeed USB 10Gbps (USB 3.2 Gen 2). Stored as the highest mode, Thunderbolt 3

PCIe generationiHighest PCIe generation the drive supports, e.g. 5 for PCIe 5.0. NVMe drives only. A drive rated for PCIe 4.0 x4 or 5.0 x2 is 5 with 2 lanes, and the source note names both modes.

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PCIe lanesiLanes the drive uses at its highest PCIe generation, usually 4. NVMe drives only.

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NVMe versioniVersion of the NVMe specification as published. A revision letter is left out, so 2.0d is stored as 2.0.

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Detachable cableiExternal drives. No means the cable is fixed to the drive.

Yes1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026One USB Type-C cable handles power and data and is listed in the package contents as a separate item

Yes6Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 2026The drive has a reinforced USB-C port and a Type-C to Type-C cable is in the box

Hardware

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ControlleriController maker and model as named by the maker or a review. On an external drive, the controller of the SSD inside, not the USB or Thunderbolt bridge chip. The bridge chip goes in the source note.

Phison PS2251-214Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Text says the Survivor uses the same controller and NAND as the EX400U. The EX400U's controller is the Phison PS2251-216Press articlegdm.or.jp/pressrelease/2025/1024/609408Read 15 October 2026Phison PS2251-218Reviewsmartworld.it/recensioni/corsair-ex400u-survivorRead 15 October 2026Spec table: Phison PS2251-219Reviewprofesionalreview.com/2025/11/29/corsair-ex400u-survivor-review/ampRead 15 October 2026Phison PS2251-2111Reviewguiahardware.es/corsair-ex400u-survivor-analisis-a-fondo-de-un-ssd-usb4-todoterrenoRead 15 October 2026Controller Phison PS2251-21. The review's weight of 149 g is the old launch figure

Sandisk in-house6Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 2026Spec table row Controller reads SanDisk Proprietary, written as Sandisk in-house like the Optimus GX PRO 850X. Text: the SSD inside is the SN750E, with the same controller as the WD Red SN700. The review tested the 2022 launch drive. No teardown of a GBC1D drive was found. Bridge chips: Intel Titan Ridge JHL7440 for Thunderbolt 3 and the ASMedia ASM2362 for USB 3.2 Gen 2. TheSSDReview names the same chips9Reviewthessdreview.com/hardware/portable-ssds/sandisk-professional-pro-g40-thunderbolt-3-dual-mode-portable-ssd-review-unbelievable-3-1gb-s-data-transfer-speedsRead 15 October 2026The review could not open the case. It says the drive uses a SanDisk SN750e M.2 SSD with an Intel JHL7440 Thunderbolt 3 controller and an ASMedia ASM2362 USB 3.2 controller

Flash typeiBits stored in each flash cell. TLC stores three and QLC stores four. A maker can use another flash type in some capacities, so it is per variant.

TLC4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Text says the same controller and NAND as the EX400U. The SSD Review reads KIOXIA TLC memory for the EX400U10Reviewthessdreview.com/hardware/portable-ssds/corsair-ex400u-usb4-external-ssd-reviewRead 15 October 2026Review of the non-rugged EX400U, which Corsair says shares its controller and NAND with the SURVIVOR: Phison PS2251-21 USB4 controller with KIOXIA TLC memory. No review of the SURVIVOR opened the drive, so this is the sibling's reading, backed by Corsair's statement and GuiaHardware's reading of the SURVIVOR11Reviewguiahardware.es/corsair-ex400u-survivor-analisis-a-fondo-de-un-ssd-usb4-todoterrenoRead 15 October 2026Spec list for the 2TB SURVIVOR: NAND Flash TLC (Kioxia)

TLC6Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 2026Text: 1TB of 96-layer BiCS4 TLC in two 512GB packages

Flash memoryiFlash maker and generation as named by the maker or a review.

Kioxia TLC9Reviewprofesionalreview.com/2025/11/29/corsair-ex400u-survivor-review/ampRead 15 October 2026Says the drive uses KIOXIA 3D NAND and that the maker does not say TLC or QLC10Reviewthessdreview.com/hardware/portable-ssds/corsair-ex400u-usb4-external-ssd-reviewRead 15 October 2026KIOXIA TLC memory. No layer count or generation is published11Reviewguiahardware.es/corsair-ex400u-survivor-analisis-a-fondo-de-un-ssd-usb4-todoterrenoRead 15 October 2026Kioxia TLC

Sandisk BiCS4 TLC6Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 2026Spec table row Memory reads SanDisk 96-Layer BiCS4, the same for 1TB and 2TB. Stored for the base 2TB as the maker for all capacities. Not checked on a GBC1D drive

Flash layersiStacked layers of the 3D flash, from the maker or a review.

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966Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 202696 layers from the Memory row

DRAM cacheiDRAM is a memory chip on the drive. HMB is a drive without DRAM that borrows host memory. None has neither. HMB not stated is a drive without DRAM where no source says whether it borrows host memory. An external drive counts when a source names the cache of the drive inside.

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DRAM6Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 2026Spec table row DRAM reads DDR4 for both capacities. Text: the drive has DRAM, so no Host Memory Buffer

DRAM cache sizeiSize of the DRAM on the drive. Any DRAM type counts, such as DDR4 or LPDDR4X. Host memory buffer (HMB) is not DRAM on the drive.

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Component sidesiWhether chips sit on one or both sides of the board. Thin laptops and some handhelds need single-sided drives. M.2 drives only. The M.2 module code states it: S is single-sided and D is double-sided, e.g. 2280-S3-M or 2280-D5-M.

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Performance

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Sequential read (claimed)iMaker's up-to sequential read speed for this capacity. Test conditions are in the source note.

4,000MB/s1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Page says up to 4,000MB/sec read and 3,600MB/sec write, with the note that performance varies by capacity. No test tool, host or queue depth is given. The 1TB and 4TB pages show the same figures4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Peak sequential performance of up to 4,000MB/s reads and 3,600MB/s writes when connected to a USB4 host

3,000MB/s1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Data Transfer Rate row, Thunderbolt 3: up to 3000MB/s read. USB-C: up to 1050MB/s read, not stored. Footnote: internal testing, 1 MB/s = 1 million bytes per second, performance may vary by host device, usage conditions and drive capacity. The same figure is given for all three capacities

Sequential write (claimed)iMaker's up-to sequential write speed for this capacity. Makers usually measure it inside the fast write cache.

3,600MB/s1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Up to 3,600MB/sec. Kakaku.com lists 3,500 MB/s write for the 1TB, which conflicts with the 1TB page and is not used4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Up to 3,600MB/s on a USB4 host

2,500MB/s1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Thunderbolt 3: up to 2500MB/s write. USB-C: up to 1000MB/s write, not stored. Same figure for all three capacities

Random 4K read (claimed)iMaker's up-to random read speed with 4 KB blocks. Queue depth and threads are in the source note. The maker's headline claim. Makers test at different queue depths, so compare with care. The queue depth 1 measured fields compare better.

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Random 4K write (claimed)iMaker's up-to random write speed with 4 KB blocks. Queue depth and threads are in the source note. The maker's headline claim. Makers test at different queue depths, so compare with care. The queue depth 1 measured fields compare better.

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Endurance and reliability

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Endurance (TBW)iTerabytes that can be written within the warranty, as the maker rates them.

500TB6Press articlegdm.or.jp/pressrelease/2025/1024/609408Read 15 October 2026Write endurance 250 TBW (1TB), 500 TBW (2TB), 1,000 TBW (4TB). The base value is the 2TB. SmartWorld and Profesional Review give the same three figures

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MTBF or MTTF (claimed)iMean time between failures, or mean time to failure when the maker publishes MTTF. The source note says which. Some makers state it per capacity, so it is per variant.

1,400,000h6Press articlegdm.or.jp/pressrelease/2025/1024/609408Read 15 October 2026MTBF 1.4 million hours, the same for all capacities8Reviewsmartworld.it/recensioni/corsair-ex400u-survivorRead 15 October 2026Spec table: MTBF 1,400,000 hours12Spec databasekakaku.com/item/K0001723770/specRead 15 October 2026MTBF 140万時間 (1.4 million hours) for the 2TB. The 1TB and 4TB pages say the same. The 1TB page lists write 3500 MB/s, which conflicts with Corsair's 3,600 and is not used. Japanese release date on the site is 2025-12-18

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Operating temperatureiMaker's operating range. The storage range is not stored.

Min0Max70°C8Reviewsmartworld.it/recensioni/corsair-ex400u-survivorRead 15 October 2026Spec table: operating temperature 0 C to 70 C9Reviewprofesionalreview.com/2025/11/29/corsair-ex400u-survivor-review/ampRead 15 October 2026Operating 0 C to 70 C and storage -40 C to 85 C, from the maker's resistance specs. Storage range not stored

Min5Max35°C1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Operating Temperature row: 41 to 95 F | 5 to 35 C

Power

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Power while reading (claimed)iMaker's average power during sequential reads, including a figure given at the full read speed. A single average or active figure with no read and write split, such as Corsair's, is stored in both read and write, and the source note says so. A maximum figure, such as Kingston's (MAX) Read, is a peak and is not stored.

4.5W4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Comparison table: Power Active Read 4.5 W. SmartWorld lists 4.5 W too8Reviewsmartworld.it/recensioni/corsair-ex400u-survivorRead 15 October 2026Spec table: power use 4.5 W, which matches Corsair's active read figure

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Power while writing (claimed)iMaker's average power during sequential writes. A single average or active figure with no read and write split is stored in both read and write, and the source note says so. A maximum figure, such as Kingston's (MAX) Write, is a peak and is not stored.

4.1W4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Comparison table: Power Active Write 4.1 W

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Max power consumption (claimed)iMaker's peak or maximum power figure. Not the average while reading or writing. Kingston publishes max read and max write power apart. Store the higher one and name both in the source note.

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Average power in light use (claimed)iMaker's average over a mixed client workload such as MobileMark. Not idle power and not read or write power.

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Idle power (claimed)iMaker's idle power in the PS3 state with APST on, or the state the maker calls low-power idle. On a SATA drive, Slumber counts as low-power idle. A plain idle figure with no low-power state, often near 1 W, is active idle and is not stored. Samsung's Idle with DIPM on is a SATA link power state, so it counts as low-power idle.

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Sleep power (claimed)iMaker's power in the deepest sleep state, PS4 or L1.2. On a SATA drive this is DevSleep.

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Measured

None of 9 known

Sequential read (measured)iCrystalDiskMark SEQ1M Q8T1 read result from a reviewer. Host and slot are in the source note. KitGuru's default profile counts as SEQ1M Q8T1.

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Sequential write (measured)iCrystalDiskMark SEQ1M Q8T1 write result from a reviewer. Host and slot are in the source note.

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Random 4K read at queue depth 1 (measured)iCrystalDiskMark RND4K Q1T1 read result from a reviewer. Small reads one at a time, close to everyday use. KitGuru's 4K QD1 1 Thread test counts as RND4K Q1T1. A CrystalDiskMark result printed in IOPS is stored as IOPS x 4096 / 1,000,000 MB/s, the way CrystalDiskMark converts.

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Random 4K write at queue depth 1 (measured)iCrystalDiskMark RND4K Q1T1 write result from a reviewer. A CrystalDiskMark result printed in IOPS is stored as IOPS x 4096 / 1,000,000 MB/s, the way CrystalDiskMark converts.

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Write cache size (measured)iData written at full speed in one long sequential write on an empty drive before the speed drops.

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Write speed after the cache (measured)iWrite speed in the first state after the fast cache is full, when the drive writes straight to TLC or QLC. Tom's Hardware calls it TLC mode. The slower folding state and the lowest dip are not stored. Only from a long sequential write test.

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3DMark Storage BenchmarkiOverall score measured by a reviewer. Host and slot are in the source note. From StorageReview only. Tom's Hardware scores the same drive about 30 percent higher, so other reviewers are not mixed in.

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Highest temperature under load (measured)iHighest drive sensor reading in a sustained write test of 10 minutes or more, on the bare drive unless the row is a heatsink version. Short benchmark runs do not count. Heatsink, airflow and room temperature go in the source note.

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Idle power (measured)iReviewer's idle reading. Power-saving settings such as ASPM are in the source note. A value read from a chart image counts when the source note says "read from chart".

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Cooling and build

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HeatsinkiVersions sold. The base lists every version and each variant row lists its own. A water block or a cooler with a fan counts as a heatsink. A thermal pad or label alone is bare. A heatsink in the box that the buyer fits, as on the XPG MARS 980 BLADE, counts as with heatsink.

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RGB lightingiAny version sold has lighting the user can set. A status LED alone does not count. Leave it out when no version has lighting. The Heatsink rows show which version has it.

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Dust and water ratingiPublished IP rating of an external drive.

IP551Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Page says a rugged, environmentally sealed enclosure (IP55)4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Comparison table IP Rating: IP55. Text: partial dust protection and protection against water jets from any direction, not submersion5Press releasecorsair.com/newsroom/press-release/corsair-adds-rugged-performance-and-mobile-convenience-to-its-storage-portfolioRead 15 October 2026Durable, impact-resistant IP55-rated housing

IP681Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Key features: high-level IP68 dust/water resistance

Drop test heightiMaker-published tested height. Surface and conditions are in the source note.

Not available

3m1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Key features: up to 3m drop protection, footnote 3 based on internal testing. The surface is not stated in the sheet. The 2022 press release says the drop was onto a carpeted concrete floor3Press releasewesterndigital.com/de-at/company/newsroom/press-releases/2022/2022-10-05-western-digital-turbocharges-versatility-with-new-sandisk-professional-pro-g40-ssdRead 15 October 2026Footnote says the 3m drop was tested on a carpeted concrete floor. Launch speeds in the release were up to 2700MB/s read and 1900MB/s write over Thunderbolt 3

Security and software

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SecurityiFeatures the maker names for the drive. Encryption done by host software does not count. ATA Security passthrough counts as password protection.

Not available

Not available

Software

Corsair SSD Toolbox1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Downloads list CORSAIR SSD Toolbox 2.0 Preview and the EX400U/EX400U SURVIVOR firmware update utility5Press releasecorsair.com/newsroom/press-release/corsair-adds-rugged-performance-and-mobile-convenience-to-its-storage-portfolioRead 15 October 2026Says the drive includes CORSAIR SSD Toolbox software for secure erase and firmware updates

SanDisk SSD Dashboard6Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 2026Text: SanDisk also provides its own SSD Dashboard software

Compatibility

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PlatformsiPlatforms the maker names for this drive. A PS5 needs a heatsink on an internal drive. PC is for a maker that writes Client PCs or PC without naming an operating system. Handheld PCs go in Other with a source note.

Windows, macOS, iOS, iPadOS1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Page names USB4/Thunderbolt 4 laptop and desktop hosts and iOS/iPadOS 13 and later with USB Type-C. The blog names Windows, macOS, iOS and iPadOS4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Text: a wide range of devices and operating systems, including Windows, macOS, iOS, and iPadOS. Works with Thunderbolt 4 and Thunderbolt 5

Windows, macOS1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Operating Systems row: macOS 10.13+ (Time Machine compatible), Windows 10+. The drive ships formatted exFAT, APFS via reformat

Dimensions and weight

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DimensionsiLength is the long side. Height is the thickness, including a fitted heatsink. As the maker publishes it. A maximum counts. Length is the long side even when the maker lists the width first.

Length82.1Width40Height17.1mm(3.2 × 1.6 × 0.7 in)4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Comparison table: 82.1 x 40 x 17.1 mm, written L x W x H. The launch spec in the Japanese press release agrees (width 40, depth 82.1, height 17.1)6Press articlegdm.or.jp/pressrelease/2025/1024/609408Read 15 October 2026Width 40 mm, depth 82.1 mm, height 17.1 mm. The same listing gives 149 g, which Corsair later replaced with 80 g9Reviewprofesionalreview.com/2025/11/29/corsair-ex400u-survivor-review/ampRead 15 October 2026About 8.2 x 4 x 1.7 cm and about 80 g

Length111Width58Height12mm(4.4 × 2.3 × 0.5 in)1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Size (LxWxH) row: 4.36 x 2.28 x 0.47 in | 111 x 58 x 12 mm. The store page prints 4.37 x 2.28 x 0.47 in

WeightiDrive alone, with a heatsink when it is sold fitted. No cable and no packaging. As the maker publishes it. A maximum counts. Not a measured weight.

80g(2.8 oz)4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Comparison table: 80 g (2.8 oz). The blog is dated as updated 2025-12-03. The launch spec reprinted by GDM gave 149 g, and Phototrend and GuiaHardware repeat 149 g. SmartWorld gives 83 g and a Phototrend reader measured 82.44 g for a 1TB drive. The later maker figure of 80 g is stored

122.3g(4.3 oz)1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Weight row: 1TB 121.2 g, 2TB 122.3 g and 4TB 123.1 g. Base value is the 2TB model

In the box

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In the box

EX400U Survivor External SSD, USB-C to USB-C cable (30cm, 40Gb)1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Package Contents row reads EX400U Survivor External SSD, USB-C to USB-C cable (30cm, 40Gb). Stored as two items

PRO-G40 SSD, Thunderbolt 3 (40Gbps) Cable, Quick Start Guide1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Box contents row: PRO-G40 SSD, Thunderbolt 3 (40Gbps) Cable and Quick Start Guide

Cables includediCables supplied with an external drive.

ACORSAIR EX400U SURVIVOR

Type	Length (m)	Count
USB-C to USB-C	0.3	1

Source1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Package contents list a USB-C to USB-C cable of 30cm that carries 40Gb

BSandisk Professional PRO-G40 SSD

Type	Length (m)	Count
USB-C to USB-C	0.2	1

Source6Reviewtomshardware.com/reviews/sandisk-pro-g40-ssd-reviewRead 15 October 2026Text: a relatively short 20cm (about 8 inch) USB Type-C to Type-C cable. TheSSDReview also says 20cm / 8 inch9Reviewthessdreview.com/hardware/portable-ssds/sandisk-professional-pro-g40-thunderbolt-3-dual-mode-portable-ssd-review-unbelievable-3-1gb-s-data-transfer-speedsRead 15 October 2026Comes with a 20cm / 8 inch Thunderbolt 3 cable

Links

Not compared

Product page

www.corsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tb1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026

www.sandisk.com/products/ssd/external-ssd/sandisk-professional-pro-g40-ssd2Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-professional-pro-g40-ssdRead 15 October 2026SanDisk US product page for the PRO-G40 SSD with a capacity picker for 1TB, 2TB and 4TB. Its spec table repeats the data sheet: up to 3000MB/s read and 2500MB/s write, Thunderbolt 3 and USB 3.2 Gen 2, 5-year limited warranty and the GBC1D part numbers

Spec sheet

Not available

documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdf1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 2026Two-page SanDisk data sheet for the PRO-G40 SSD, PDF created 2023-12-01, on documents.sandisk.com. It lists 1TB, 2TB and 4TB with the GBC1D part numbers

Manual

Not available

Not available

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

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Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

5years1Maker product pagecorsair.com/us/en/p/data-storage/cssd-ex400us2tb/ex400u-survivor-2tb-usb4-external-ssd-cssd-ex400us2tbRead 15 October 2026Page says a five-year warranty4Maker product pagecorsair.com/us/en/explorer/diy-builder/storage/corsair-ex400u-survivor-everything-you-need-to-knowRead 15 October 2026Comparison table: 5 years, against 3 years for the EX400U5Press releasecorsair.com/newsroom/press-release/corsair-adds-rugged-performance-and-mobile-convenience-to-its-storage-portfolioRead 15 October 2026Five-year limited warranty

5years1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk-pro/product/portable-drives/pro-g40-ssd/data-sheet-sandisk-professional-pro-g40-ssd.pdfRead 15 October 20265 YR limited warranty. The sheet points to sandisk.com/wug for terms and names no market

Both are also in the API. Back to all SSDs.