TEST: Transcend JetFlash 790 256GB USB flash drive

Technical data
Image
Manufacturer	Transcend
Model number	TS256GJF790K
Storage capacity	256 GB (225 GiB)
Read speed	90 MB/s
Write speed	45 MB/s
Connection	USB Typ A
Price	ca. 27 USD (= 0,11 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

14 %

Write speed

6 %

*) Test result evaluated according to AS SSD Score within the same size.

AS SSD Benchmark

Standard performance test

The standard test was performed using a 1 GB file. A total score of 89 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	149,62 MB/s	60,69 MB/s
4K in megabytes per second	10,67 MB/s	13,39 MB/s
4K-64Thrd in megabytes per second	11,15 MB/s	13,77 MB/s
Access time in milliseconds	0,151 ms	0,616 ms
Score	37	33
Total score	89

Copy Performance Test

A common everyday situation is simulated here. Three test folders are created:

• ISO (folder with two large files)
• Program (folder with many small files)
• Game (folder with small and large files)

The three folders are copied using the Windows Copy command (the cache remains enabled). The practical test of February 17, 2021 shows the performance for simultaneous write and read operations. The lower the duration, the better the performance.

AS SSD Copy-Benchmark	Transfer rate:	Duration:
ISO two large files	61,95 MB/s	17,34 s
Program many small files	32,10 MB/s	43,83 s
Game small and large files	50,72 MB/s	27,23 s

Compression Performance Test

This measures the write and read speed of the the Transcend USB flash driveSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 90MB/s and 45MB/s respectively).

CrystalDiskMark Benchmark

Here, two sequential and two random performance tests are performed, similar to the ones performed on the AS SSD.

CDM	Read [MB/s]	Write [MB/s]
SEQ1M Q8T1	156,41	64,51
SEQ1M Q1T1	157,27	66,00
RND4K Q32T16	12,61	13,80
RND4K Q1T1	11,36	13,50

HD Tune Pro Benchmark

HD Tune writes a 1 GB file to the 256 GB Transcend USB flash drive. The transfer data of the read speed is displayed graphically. The minimum, maximum and average values are also determined. The determined access time and burst rate are also displayed.

ATTO Disk Benchmark

Here, a 256 MB file is written several times to the 256 GB Transcend USB flash drive . The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster they can be written and read.

The benchmark test was performed on February 17, 2021.
Information about the test system can be found at the bottom of the home page.
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