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::>Storage devices > 2014 > 05 > Transcend SDXC UHS-I U3

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Transcend 128 GB SDXC UHS-I U3 (TS128GSDU) Flash Memory Card

The manufacturers of memory cards must keep pace to develop and bring to market a topical solution that can offer both high speed performance and a large amount of storage.

The range of Transcend includes a whole line of productive solutions Transcend SDXC/SDHC UHS-I U3 designed to work with high-quality content. One of its representative Memory Card Transcend SDXC UHS-I U3 (TS64GSDU3X) we have already introduced you earlier. It has demonstrated a very high speed. Also the line includes the model TS32GSDU3X, which differs by similar performance characteristics but has a smaller capacity (32 GB).

 The range is not competing only with this solution. 

Under the same name Transcend SDXC UHS-I U3 there are two solutions a 128 GB model TS128GSDU3 and its 64 GB analogue TS64GSDU3. Their declared write speed is slightly smaller but the overall performance remains one of the highest in the class.

Transcend SDXC UHS-I U3 (TS128GSDU)

In the current review we are going to examine the most capacious solution Transcend SDXC UHS-I U3 (TS128GSDU3) with capacity of 128 GB.

The specs:

Producer and model

Transcend SDXC UHS-I U3

(128 GB TS128GSDU version is under testing)

UHS-I support

Class 3

Speed class


Capacity variation, GB

TS128GSDU - 128

TS64GSDU - 64

Max read speed, MB/s


Max write speed, MB/s


Durability, connection/disconnection cycles

10 000

Working voltage, V


Working temperature,  C


Overall dimensions, mm

32 x 24 x 2,1

Weight, g


Warranty, year

Limited life assurance

Producer website


Product page

As you can see, the write speed of TS128GSDU and TS64GSDU is slightly lower than TS64GSDU3X and TS32GSDU3X: 60 MB/s instead of 85 MB/s. Note that it will not influence the ability to work with 4K Ultra HD video expansion. For its record sufficient speed is 30 MB/s.

Design and packaging

Transcend SDXC UHS-I U3 (TS128GSDU)

A high class device is indicated by package made predominantly in black color. It contains the following information: the type of memory card (SDXC), capacity (128 GB), the maximum read and write speeds (95 and 60 MB/s), high-speed class (Class 10), a note about the support specification UHS-I Class 3 and information about the main destination device, i.e. video in 4K Ultra HD record. Also here there is an icon reminding limited lifetime warranty. 

Transcend SDXC UHS-I U3 (TS128GSDU)

The back side of the package is notable for the presence of general information about the memory card in 21 languages. So, the manufacturer lists the devices intended for the card: cameras, video cameras, recording devices and automatic GPS-navigators. Separately pay your attention to support of standard memory cards SDXC.

As is the case with many other Transcend drives the manufacturer offers a free download the utility RecoveRx, allowing for a few mouse clicks to recover deleted files from a memory card.  

The guiding line during the selection of the required size of a drive is a table placed in the upper left corner. It indicates the approximate amount of content that can fit on this carrier. So, 128 GB can be used for storage: 52416 for ten megapixel and 26208 five megapixel images, 704 hours of video in a resolution of 320 x 240 pixels, 32 hours of Full HD-video or 8 hours of video in format 4K Ultra HD.

Transcend SDXC UHS-I U3 (TS128GSDU)

Transcend SDXC UHS-I U3 (TS128GSDU)

Inside the package you can find a brief specification of the memory card and the basic warranty conditions for 12 languages.

Transcend SDXC UHS-I U3 (TS128GSDU)

Transcend SDXC UHS-I U3 (TS128GSDU)

The outside design of solutions Transcend SDXC UHS-I U3 (TS128GSDU) is made a match of packaging. Here is ablack plastic combined with red and gold label, where you can find the most important information on the memory card: its capacity, high-speed characteristics and supported specifications (UHS-I Class 3).

Reverse side, except for the serial number and compliance EU standards requirements contains information about the location of its production place (Taiwan).

Transcend SDXC UHS-I U3 (TS128GSDU)

On default the drive is formatted as a single exFAT volume and available capacity is 119 GB. Mismatch with the specified 128 GB is connected with decimal transfer of units received binary data instead.

Transcend SDXC UHS-I U3 (TS128GSDU)

According to utility HD Tune Pro the product supports such modern technologies as NCQ, S.M.A.R.T. and TRIM. They have the following purpose:

  • NCQ Native Command Queuing, which allows to optimize the performance of the drive;
  • S.M.A.R.T. (self-monitoring, analysis and reporting technology) - monitoring system that monitors the status of the drive so you can predict when its failure;
  • TRIM - allows you to directly delete stored in flash memory data and to release immediately unactuated place (free blocks) to write new data.

Manufacturer also claims about the support of ECC error correction algorithm and cryptographic method of content protection CPRM.

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