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Verdict: The Toshiba XG5 1TB (KXG50ZNV1T02) was an efficient, fast PCIe 3.0 OEM SSD in 2017. Its short-transfer performance remains adequate for a modern desktop or game library, but its large SLC cache can collapse during long writes, and the product is now discontinued. Buy one only when the used price is clearly below a new SSD, SMART data is clean, and your system accepts a single-sided M.2 2280 NVMe drive.
What the Toshiba XG5 1TB is
The 1TB model is identified by Toshiba part number KXG50ZNV1T02. It is a single-sided M.2 2280-S2 drive with an M-key connector, PCIe Gen3 x4 interface and NVMe 1.2.1 protocol. Toshiba used 64-layer BiCS 3D TLC NAND in the XG5 series, which also included 256GB and 512GB capacities. The nominal capacity is 1,024GB; the formatted capacity is lower because of file-system overhead and overprovisioning.
| Specification | XG5 1TB detail |
|---|---|
| Model | KXG50ZNV1T02 |
| Form factor | M.2 2280-S2, single-sided |
| Interface | PCIe Gen3 x4 (up to 32 GT/s aggregate link rate) |
| Protocol | NVMe 1.2.1 |
| NAND | 64-layer Toshiba BiCS 3D TLC |
| Reference sequential read | Up to 3,000 MB/s |
| Reference sequential write | Up to 2,100 MB/s |
| Official random I/O specification | Not universally published |
| Product status | End of Sales |
Those headline speeds come from Toshiba’s reference design announcement (Toshiba) and the series brief (Kioxia/Toshiba PDF). They are maximum reference figures, not a guarantee for every laptop-specific XG5.
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The XG5 was primarily supplied to computer manufacturers rather than sold as a standardized retail drive. Toshiba allowed OEM customers to tune firmware, power limits and thermal behavior for a particular laptop. Consequently, two drives carrying the XG5 name can behave differently, and a unit removed from an HP, Dell, Lenovo or Acer system may have system-specific firmware.
#1 Best Overall
- Compact design with stylish, textured finish and color options to fit your lifestyle.
- Automatic backup software to easily back up your content (free download, for Windows PC only).
- Password protection software to help prevent unauthorized access to your data (free download, for Windows PC only).
- USB 3.0 and USB 2.0 compatible.
Public documentation does not provide a reliable, universal DRAM specification for every XG5 1TB variant. Do not label an unknown board as either DRAM-equipped or DRAM-less solely from a product listing. Likewise, random-IOPS numbers found online may describe a measured sample, an XG5-P model or another OEM configuration rather than the base XG5.
Performance: fast bursts, weak long writes
Historical reviews show why the XG5 can look excellent in a short benchmark yet disappoint during a large copy. Its SLC cache absorbs bursts at close to the advertised write rate. Once that cache is full, data is written to native TLC NAND at a much lower and more variable rate.
Sequential throughput
AnandTech found that low-queue-depth sequential reads scaled more slowly than contemporary Samsung 960 EVO and 960 PRO drives, although the XG5 could deliver very strong short sequential writes. In longer sequential-write testing, throughput eventually fell to roughly SATA-like levels after the cache was exhausted (AnandTech results).
Rank #2
- MADE FOR THE MAKERS: Create; Explore; Store; The T7 Portable SSD delivers fast speeds and durable features to back up any endeavor; Build your video editing empire, file your photographs or back up your blogs all in an instant
- SHARE IDEAS IN A FLASH: Don’t waste a second waiting and spend more time doing; The T7 is embedded with PCIe NVMe technology that brings fast read and write speeds up to 1,050/1,000 MB/s¹, making it almost twice as fast as the T5
- ALWAYS MAKE THE SAVE: Compact design with massive capacity; With capacities up to 4TB, save exactly what you need to your drive – from large working files to game data and everything in between
- ADAPTS TO EVERY NEED: Whether using a PC or mobile phone, count on the T7 for extensive compatibility²; It’s a true team player when it comes to heavy-duty application usage or file-saving
- HI RESOLUTION VIDEO RECORDING: Record Ultra High Resolution (4K 60fs) videos directly onto the T7 Portable SSD with your favorite camera or mobile devices; Supports iPhone 15 Pro Res 4K at 60fps video and more³
Mixed and steady-state workloads
Mixed workloads were less impressive than the best PCIe 3.0 Samsung drives. Tom’s Hardware nevertheless found good steady-state sequential and random-write consistency compared with many TLC competitors, while its extended PCMark 8 testing showed variability (Tom’s Hardware results).
What that means in practice
- Booting and applications: Responsive on a PCIe 3.0 system; latency and software behavior matter more than peak sequential numbers.
- Gaming: Adequate for game storage. Do not expect a meaningful loading-time advantage over a good modern PCIe 3.0 SSD.
- Short file transfers: Usually fast while the SLC cache has room.
- Large transfers, video work and disk images: More likely to expose the post-cache slowdown.
- Laptops: Relatively low power use was a historical strength, but actual behavior depends on the laptop’s firmware, cooling and power limits.
Compatibility checklist for a modern system
The drive is electrically compatible with newer PCIe generations, but it negotiates at Gen3-class speed. Check every item before buying:
- Your slot must be an M.2 M-key NVMe slot; an M.2 SATA-only slot will not work.
- The bay must support the 2280 length and provide a screw or retention mechanism.
- The motherboard or laptop must route PCIe lanes to that slot.
- Thin laptops may require a single-sided module, which is an advantage for the XG5, but heatsinks and brackets still need clearance.
- Some OEM systems whitelist storage devices or impose BIOS-specific restrictions.
- Older computers may need a BIOS update for NVMe boot support.
- For cloning, keep the system in UEFI mode, verify NVMe boot support and save recovery keys if device encryption is enabled.
Confirm the slot and physical requirements against the manufacturer’s manual and the XG5 series brief (official specifications).
Rank #3
- NEARLY 2X FASTER THAN OUR PREVIOUS GENERATION(8) – move 1,000 high-res photos in under 60 seconds(6) with up to 2000MB/s transfer speeds(2).
- IP65 RATING AND UP TO 3M DROP PROTECTION(3) – protects against spills and drops.
- POCKET-SIZED – fits easily in pockets and small bags.
- SPACE TO OWN YOUR AI CONTENT – speed and capacity to download your high-res clips and photo edits.
- 256-BIT AES ENCRYPTION(4) – helps keep private files secure with password protection.
How to inspect a used XG5 before purchase
Since Kioxia marks the series End of Sales, most units now come from used or open-box listings. Marketplace asking prices observed in 2026 included roughly $100–$120 for 1TB examples, with some listings higher; these are not completed-sale data.
- Match the label to KXG50ZNV1T02. Do not confuse XG5 with XG5-P, XG6, XG7 or another Kioxia OEM model.
- Request a current SMART screenshot from CrystalDiskInfo, smartmontools or an equivalent NVMe utility.
- Check total host writes and reads, percentage used or remaining life, unsafe shutdowns, media/data-integrity errors and controller temperature.
- Ask for confirmation that the drive links at the expected PCIe width and speed.
- Prefer a seller with a return window and avoid stock-photo listings or claims of transferable retail warranty.
- Require secure erasure before reuse. A “tested” drive may still contain recoverable data if it was not erased.
Observed examples include an eBay listing around $100 (individual listing) and category listings ranging higher (eBay category). At approximately $100 used, the XG5 competes directly with newer warrantied products.
Endurance, firmware and warranty cautions
Toshiba marketed the XG5 as an OEM client drive. There is no single universal TBW figure or consumer warranty policy that can safely be applied to every 1TB unit. Warranty rights may belong to the original system manufacturer and may not transfer with a drive removed from a laptop. Judge a used unit by its SMART history and seller protection rather than an assumed endurance rating.
Rank #4
- Solid state performance with up to 800MB/s read speeds in a portable drive. (Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes.)
- Back up your content and memories on a storage solution that fits seamlessly into your mobile lifestyle.
- Take it with you on your adventures—up to two-meter drop protection means this durable drive can take a beating. (Based on internal testing.)
- Secure it to your belt loop or backpack for extra peace of mind thanks to the tough rubber hook.
- From Sandisk, a brand professional photographers trust to take on assignments.
Current Toshiba or Kioxia utilities may not recognize every OEM firmware variant. Generic NVMe health tools and the original laptop manufacturer’s support page are the practical fallbacks.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Alternatives in 2026
New PCIe 4.0 TLC SSD
A current PCIe 4.0 TLC drive generally offers higher throughput, newer firmware, clearer endurance specifications and a real retail warranty. In a PCIe 3.0-only laptop it will normally run at the older link speed, so the benefit is support and condition rather than full Gen4 performance.
Samsung 990 EVO Plus 1TB
Samsung lists up to 7,150 MB/s reads and 6,300 MB/s writes for its 1TB 990 EVO Plus. Its US product page showed a direct price of $289.99 and an out-of-stock status when captured, while Samsung’s December 2025 MSRP file listed $154.99; neither figure should be treated as a universal street price (Samsung product page; MSRP document).
Best Value
- High-Efficiency Performance: The SSD 1TB SATA adopts 3D NAND flash memory, which achieves a read speed of up to 560MB/s and a write speed of up to 510MB/s. Get a faster data transfer experience and improve your work efficiency.
- Upgrate Your Computer: The SATA 1TB SSD achieved faster app load and response times, and faster boot-up and shut-down, compared to HDDs. The internal SSD adopts advanced SLC Cache Technology, which improves overall computer performance.
- Reliability and Stability: The 2.5 SSD 1TB supports garbage collection, advanced wear-leveling technology, RAID, ECC, TRIM, and S.M.A.R.T, which makes the SATA SSD more reliable and stable. With the characteristics of shockproof, the SSD hard drive can keep your data safe, without worry even if your computer drops.
- Wide Compatibility: The 2.5'' SSD built-in SATA III 6Gb/S interfaces, witch backwards compatible with SATA II and SATA interfaces. The Internal SATA SSD is compatible with Windows, Linux, and Mac OS, and compatible with laptops, desktops, and all-in-one computers.
- 3-Year Service: Our SSDs come with a 3 years after-sales service and lifetime technical support. If you have any questions, please contact us and we will sincerely and professionally solve the problem for you.
Used PCIe 3.0 drives
A used Samsung 970 EVO Plus, WD Blue SN570/SN580 or similar model may be preferable when its exact identity and SMART history are documented, its price is lower, and firmware support is easier. Do not assume a performance ranking without comparable testing.
Who should buy the XG5?
- Good fit: a PCIe 3.0 laptop needing an inexpensive, single-sided 2280 replacement; an existing XG5 with clean SMART data; ordinary office work, applications or gaming.
- Conditional fit: a desktop owner who accepts used-drive risk and buys substantially below new-drive pricing.
- Skip it: when the seller provides no health data, the price approaches a new SSD, the workload involves frequent multi-hundred-gigabyte writes, or a manufacturer warranty matters.
The XG5 remains technically competent for its generation, but its value is now determined by the individual unit’s health, compatibility and price—not by its 2017 benchmark reputation.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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