TransMemory U366 USB Flash Drive

Sleek, Stylish Storage




16GB 32GB 64GB 128GB

Max Read Speed(1)

200 MB/s (128GB)
100 MB/s (16GB, 32GB, 64GB)
Max read speed may not be displayed on the product package.


File Transfer on PC and Mac

KIOXIA TransMemory U366 USB flash drives support USB 3.2 Gen 1 interface type-A with small, stylish metallic body.

TransMemory U366 USB Flash Drive Product Specifications


  • Capacity
    16GB, 32GB, 64GB, 128GB
  • Approximate Usable Capacity(2)
    14.4GB, 28.8GB, 57.6GB, 115.2GB
  • Interface
    USB 3.2 Gen 1 Super Speed compatible / USB 2.0 high-speed compatible(3)
  • Dimension (LxWxH)
    39.0 x 12.2 x 4.5mm
  • Weight
    Approx. 6 g
  • Power Supply
    USB bus-power


  • Max Read Speed(1)
    16GB, 32GB, 64GB: 100 MB/s
    128GB: 200 MB/s


  • Operating Temperature
    0 °C to 50 °C (no condensation)
  • Storage Temperature
    -20 °C to 60 °C
  • Certification
    RoHS compliant(4)


  • Compatible PC & Mac
    Models equipped with the following OS, and the Type-A USB interface as a standard feature.
    Compatible with macOS Mojave 10.14, macOS Catalina 10.15, macOS Big Sur 11, macOS Monterey 12
    Windows 8.1, Windows 10 and Windows 11
    (As of December 21, 2021)

Additional Features

  • Services and Support
    5-year limited warranty

Ordering Information

  • 16GB
    PN: LU366S016GG4
    EAN: 4582563853829
  • 32GB
    PN: LU366S032GG4
    EAN: 4582563853843
  • 64GB
    PN: LU366S064GG4
    EAN: 4582563853867
  • 128GB
    PN: LU366S128GG4
    EAN: 4582563853881

KIOXIA USB Flash Drive Comparison

Model Name U366 U365 U301 U401 U203 U202
Capacity(2) 16, 32, 64, 128GB 32, 64, 128, 256GB 16, 32, 64, 128GB 16, 32, 64GB 16, 32, 64, 128GB 16, 32, 64, 128GB
Max Read Speed(1) 128GB:
200 MB/s
16GB, 32GB, 64GB: 100 MB/s
150 MB/s -- -- -- --
Interface USB 3.2 Gen 1 USB 3.2 Gen 1 USB 3.2 Gen 1 USB 2.0 USB 2.0 USB 2.0
Warranty Period 5 year 5 year 5 year 5 year 5 year 5 year

(1) 1 MB/s is calculated as 1,000,000 bytes/s. The value is the best value obtained in specific test environment at KIOXIA Corporation and KIOXIA Corporation does not warrant read speed use in individual devices. Read speed may vary depending on user-specifications such as devices used and file size read. The write speed is lower than the read speed.

(2) Capacity is based on installed flash memory and not user available memory as part of the memory is used for management functions. Available user area are as listed above (1GB = 1,073,741,824 bytes).

(3) The terms 'USB 3.2 Gen 1 Super Speed' and 'USB 2.0 high-speed' used herein are the name of specifications upon which this product is based; they do not warrant the speed of its operation.

(4) KIOXIA Corporation defines “RoHS Compatible” products as products that either ( i ) contain no more than a maximum concentration value of 0.1% by weight in Homogeneous Materials for lead, mercury, hexavalent chromium, polybrominated biphenyls (PBBs), polybrominated diphenyl ethers (PBDEs), bis(2-ethylhexyl) phthalate (DEHP), dibutyl phthalate (DBP), benzyl butyl phthalate (BBP) and diisobutyl phthalate (DIBP) and of 0.01% by weight in Homogeneous Materials for cadmium; or ( ii ) fall within any of the application exemptions set forth in the Annex to the RoHS Directive(*). This does not mean that Kioxia Corporation products labeled “RoHS COMPATIBLE” are entirely free of substances controlled by the RoHS Directive and does not constitute a warranty or guarantee that such products will comply with the specific laws and/or regulations adopted in any particular jurisdiction.

*RoHS Directive: KIOXIA Corporation defines “RoHS Directive” as the DIRECTIVE 2011/65/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment.

• To protect against accidental data loss, back up your data frequently on other storage media.

• Product specifications and design are subject to change without prior notice.