TEST: Transcend JetFlash 920 512GB USB flash drive

Technical data
Image
Manufacturer	Transcend
Model number	TS512GJF920
Storage capacity	512 GB (466 GiB)
pSLC-Cache	25 GB approx.
Read speed	420 MB/s
Write speed	400 MB/s
Interface	USB 3.2 Gen 1x1 (5 Gbit/s)
Connection	USB Typ A
Price	ca. 43 USD (= 0,08 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

58 %

Write speed

62 %

*) 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 186 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	333,41 MB/s	275,61 MB/s
4K in megabytes per second	16,40 MB/s	21,58 MB/s
4K-64Thrd in megabytes per second	19,78 MB/s	27,31 MB/s
Access time in milliseconds	0,146 ms	0,352 ms
Score	70	76
Total score	186

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 October 10, 2025 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	288,71 MB/s	3,72 s
Program many small files	112,73 MB/s	12,48 s
Game small and large files	208,13 MB/s	6,64 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 420 MB/s and 400 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	363,58	369,65
SEQ1M Q1T1	355,39	367,92
RND4K Q32T16	37,70	28,75
RND4K Q1T1	27,07	22,97

HD Tune Pro Endurance test

This is a long term test to make full use of the memory capacity. You can see when a cache is full and the writing performance decreases. A test file of 50 GB was written to the medium. After approx. 25 GB, the pSLC-Cache was full and the performance was throttled.
The average read speed was 314 MB/s and the average write speed was 224 MB/s.

ATTO Disk Benchmark

Here, a 256 MB file is written several times to the 512 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.

SSD-Z Benchmark

Similar to HD Tune, a 500 MB file is written to the 512 GB Transcend USB flash drive here. The transfer data is displayed. The more constant the line, the better.

The benchmark test was performed on October 10, 2025.
Information about the test system can be found at the bottom of the home page.
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