TEST: Transcend JetFlash 780 128GB USB flash drive

Technical data
Image
Manufacturer	Transcend
Model number	TS128GJF780
Storage capacity	128 GB (113 GiB)
Read speed	400 MB/s
Write speed	150 MB/s
Connection	USB Typ A
DRAM Cache	no
Price	ca. 156 USD (= 1,22 $ / GB)
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Compared to the top performer*

Read speed

36 %

Write speed

25 %

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

AS SSD Benchmark

Standard performance test

The standard test was performed with a 1 GB file. A total score of 131 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	355,86 MB/s	150,84 MB/s
4K in megabytes per second	15,27 MB/s	9,34 MB/s
4K-64Thrd in megabytes per second	15,49 MB/s	9,23 MB/s
Access time in milliseconds	0,126 ms	0,604 ms
Score	66	34
Total score	131

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 November 27, 2020 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	145,75 MB/s	7,37 s
Program many small files	48,81 MB/s	28,82 s
Game small and large files	102,43 MB/s	13,48 s

Compression Performance Test

Here, the writing and reading speed of the the Transcend USB flash driveSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 400MB/s and 150MB/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	401,12	156,36
SEQ1M Q1T1	401,07	157,68
RND4K Q32T16	18,06	9,61
RND4K Q1T1	16,18	9,65

HD Tune Pro Benchmark

HD Tune writes a 1 GB file to the 128 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 128 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 November 27, 2020.
Information about the test system can be found at the bottom of the home page.
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