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Home > Hardware Reviews > Mobiles

Thursday, February 22, 2018
Testing Toshiba's Storage devices: FlashAir W-04, TransMemory U363 and U364 flash drives

2. Toshiba U363 and U364 TransMemory USB 3.0 flash drives

Portable storage space is important to everyone, and the Toshiba U363 and U364 TransMemory USB 3.0 flash drives are both designed to become your every day companions at the office, home of during your trips.

These two drives appear to use the same speed and capacity of flash memory, differing only in their appearance. The U363 uses a slim metal body, with a small loop at the end to allow for attachment to a key ring or similar. The U364 is intended to be as small as possible, so that you can leave it permanently plugged into a laptop or another computer.

Both the U363 and U364 TransMemory USB 3.0 flash drives are available in 32/64/128GB capacities, can reach read speeds of up to 120MB/s and feature the Phison PS2251-07(PS2307) USB-to-Flash micro-controller chip along with Toshiba TLC NAND flash modules. The specifications of both drives are identical and they are covered with a 5 year limited warranty.


  Toshiba U363 Toshiba U364
Capacities 32GB / 64GB / 128GB
Interface Super Speed USB 3.0 and Hi-Speed USB 2.0
Read Speed Up to 120 MB/s
Power Supply Bus powered from USB port.
Compatible PC Models Models equipped with the following OS, and the Type-A USB interface as a standard feature: OS X v10.6.6 - v10.11, macOS X v10.12, Windows 7, Windows 8.1, Windows 10
Warranty 5 Years
Dimensions 39 mm (L) x 12.2 mm (W) x 4.5 mm (H) 16.8 mm (L) x 15.2 mm (W) x 6.8 mm (H)
Weight Approx. 6g Approx. 3g
Operating Temperature 0° to +40°C (Recommended) 0° to +50°C (Recommended)
Storage Temperature -20° to +60°C (Recommended)


Toshiba U363
Toshiba U364

The drives show reasonable performance in CrystalDiskMark, with almost no differences between the two models. The drives max out just over 92 MB/s for reading and nearly 18 MB/s for writing. The reading performacne is a bit lower than what we expected, after reading the "up to 120 MB/s" claim on the drives' specifications. Similarly, writing many small files remains incredibly slow, in both sequential and higher queue depth write tasks.

Launched by Toshiba Electronics Europe, the 64GB drives are currently available for a price of 20 Euros, making them very affordable for everyone. That means choosing between them is all about the form factor.


  • Build Quality
  • Size and design
  • Capacity
  • 5 Year Warranty
  • Price


  • Performance

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