Our take
The Transcend StoreJet 25M3 TS640GSJ25M3 is a specific older portable 640GB USB 3.0 hard drive with documented USB 2.0 backward compatibility, USB power, and a protective rubberized case with internal suspension. It can suit a modest archive or transfer routine when the exact model and working condition are confirmed. The old exact listing is no longer available, and current OS support, software availability, measured drive speed, a current Amazon offer, and any individual unit's health remain unverified.
A modest portable archive or transfer set for a USB 2.0 or USB 3.0 host when 640GB is enough and the actual cable and unit can be checked.
Buyers who need at least 1TB, a verified current Amazon offer, a measured transfer rate, current OS or software support, or a proven military drop-test certification for this exact 640GB SKU.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The exact-model source identifies 640GB, USB 3.0, and USB 2.0 backward compatibility.
- The old listing describes USB power without a separate AC adapter, while recommending its USB power cable for adequate operation.
- The exact listing describes rubberized anti-shock casing and an internal suspension system for the drive.
What to weigh up
- The 640GB nominal capacity is below the existing 1TB threshold and leaves less room for a growing archive.
- The listing recommends a separate USB power lead and warns that an insufficiently powered hub may cause problems.
- The exact old listing is unavailable, and current OS/software support, measured performance, Amazon identity, cable contents, and unit condition are unknown.
The key details
| Model covered | TS640GSJ25M3 |
|---|---|
| Advertised capacity | 640GB advertised capacity |
| Drive configuration | 640GB portable HDD; StoreJet 25M3 TS640GSJ25M3 |
| Host connection | USB 3.0 with documented USB 2.0 backward compatibility |
Performance figures are manufacturer claims. Source checked October 9, 2026. Regional models and included accessories can differ.
What the features mean for you
Is 640GB enough for the archive you have?
The exact-model retailer listing identifies this configuration as a 640GB external HDD. That nominal capacity sits above the comparison's 400GB and 500GB floors, so it can hold a modest photo, document, music, or transfer set when the owner has estimated the space required. It does not meet a 1TB minimum, and formatted usable space is lower than the number on the label. If the collection is expanding or the drive will hold a large long-term backup, leave room for growth or choose a larger capacity. The saved source gives no measured rate for this disk, so capacity and interface should not be mistaken for a performance guarantee.
What do USB 3.0 and USB 2.0 compatibility establish?
The exact-model listing names USB 3.0 and backward compatibility with USB 2.0. A USB 3.0 host is the natural connection when available; the documented USB 2.0 path keeps the model relevant to an older computer with that port. A slower host standard remains a slower connection, and the seller's interface headline is not a measured throughput result from the drive. The saved record does not establish USB-C adapters or support for a current operating system. Match the model's original connection to the computer you plan to use, and verify any adapter or driver separately.
How should the USB power and cable note affect setup?
The old exact-model page describes USB power and says that a separate USB power cable is included or recommended to provide adequate operation; it also cautions against a hub that may not supply enough power. That is useful for a setup without a separate wall adapter, but it is not a promise that every host port, hub, or surviving cable will work reliably. Check which lead is present with the actual unit and connect it directly to a suitable host when troubleshooting. Treat the listed box contents as information about the old retailer configuration, not a guarantee about another seller's package or a used drive.
Does the rubberized case make it safe from drops?
The exact-model listing describes a rubberized anti-shock outer case and an internal suspension system. Those are meaningful construction details for a portable hard drive that may be moved between locations. They do not show that a particular unit has survived an impact, that files are protected from every drop, or that the 640GB SKU passed a military-standard test. The historical source title's military-grade wording is not enough to verify such a certification, and newer StoreJet family testing claims are not transferred to this older model. Keep another copy of important data and inspect a used drive rather than treating the enclosure as a backup plan.
What do the old format and software details mean now?
The archived listing reports FAT32 and mentions Transcend Elite software and a one-touch backup button. Those descriptions can help identify the older product, but they do not establish that the utility remains available, works with a current operating system, or is included with an individual used unit. Check the actual drive's format before moving files, and confirm any software requirement with Transcend for the exact model and the computer in use. The saved research does not verify present-day Windows or macOS compatibility, a current download, or the age and state of the disk.
Who should choose a different configuration?
Choose a larger drive when 1TB or more is a firm requirement. Choose a current SSD if the job depends on a documented solid-state medium or a measured modern transfer result; this older listing provides no exact drive-speed result. Choose another model when USB-C, guaranteed current OS support, console preparation, or direct television playback is essential, because those facts are not established for TS640GSJ25M3. This StoreJet is most defensible when 640GB is enough, USB 2.0 or 3.0 fits the host, and the exact label, power lead, seller terms, and unit condition can be checked before purchase.
What else to compare
Before you buy
Is military-grade certification verified for TS640GSJ25M3?
No. The historical title uses that wording, but the saved exact-model evidence documents a rubberized case and internal suspension rather than a verified military certification for this 640GB SKU.
Does USB 3.0 mean the drive transfers at 5Gbps?
No. That figure describes the interface headline, not a measured result from this hard disk. The exact-model listing leaves disk speed unspecified.
Can I use it away from a wall outlet?
The old listing describes USB power without a separate AC adapter, but recommends its separate USB power cable. Check the actual lead and host power before relying on it away from an outlet.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- B&H exact-model listing for Transcend StoreJet 25M3 model TS640GSJ25M3 ↗ — checked October 9, 2026.
- B&H indexed exact-model listing identifying TS640GSJ25M3, green 640GB configuration, USB 3.0/2.0 support, USB power, rubberized case, internal suspension, cable guidance, and FAT32; direct open returned a cache miss and the listing says no longer available ↗ — checked October 9, 2026.
- Transcend StoreJet 25M3 family page used only as family context; newer family capacities and interface/testing claims are not applied to TS640GSJ25M3 ↗ — checked October 9, 2026.
The decision
The Transcend StoreJet 25M3 TS640GSJ25M3 is a specific older portable 640GB USB 3.0 hard drive with documented USB 2.0 backward compatibility, USB power, and a protective rubberized case with internal suspension. It can suit a modest archive or transfer routine when the exact model and working condition are confirmed. The old exact listing is no longer available, and current OS support, software availability, measured drive speed, a current Amazon offer, and any individual unit's health remain unverified.
Is it the right fit?
Check the exact model and today’s offers on Amazon.