TEST: Transcend JetFlash 780 32GB USB flash drive

Technical data
Image
Manufacturer	Transcend
Model number	TS32GJF780
Storage capacity	32 GB (28 GiB)
Read speed	400 MB/s
Write speed	150 MB/s
Connection	USB Typ A
Price	ca. 19 USD (= 0,59 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

100 %

Write speed

41 %

*) 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 115 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	378,19 MB/s	50,79 MB/s
4K in megabytes per second	14,59 MB/s	9,13 MB/s
4K-64Thrd in megabytes per second	14,99 MB/s	8,92 MB/s
Access time in milliseconds	0,141 ms	0,607 ms
Score	67	23
Total score	115

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 December 23, 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	49,34 MB/s	21,77 s
Program many small files	31,57 MB/s	44,56 s
Game small and large files	43,79 MB/s	31,54 s

Compression Performance Test

This measures the write and read speed of the Transcend USB flash drive, depending on the compressibility of the data (according to the manufacturer, these should be 400 MB/s and 150 MB/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	381,43	51,33
SEQ1M Q1T1	383,14	51,52
RND4K Q32T16	16,94	9,14
RND4K Q1T1	15,33	9,25

HD Tune Pro Benchmark

HD Tune writes a 1 GB file to the 32 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 32 GB Transcend USB flash drive. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster they were written and read.

The benchmark test was performed on December 23, 2020.
Information about the test system can be found at the bottom of the home page.
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