TEST: Lexar JumpDrive D400 256GB USB flash drive

Technical data
Image
Manufacturer	Lexar
Model number	LJDD400256G-BNQNU
Storage capacity	256 GB (231 GiB)
Read speed	130 MB/s
Write speed	not specified
Connection	USB Typ A+C
Price	ca. 41 AUD (= 0,16 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

12 %

Write speed

7 %

*) 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 41 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	127,36 MB/s	41,61 MB/s
4K in megabytes per second	5,78 MB/s	1,29 MB/s
4K-64Thrd in megabytes per second	5,39 MB/s	1,30 MB/s
Access time in milliseconds	0,528 ms	2,298 ms
Score	24	7
Total score	41

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 September 25, 2023 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	41,74 MB/s	25,73 s
Program many small files	16,47 MB/s	85,42 s
Game small and large files	29,85 MB/s	46,26 s

Compression Performance Test

Here, the writing and reading speed of the the Lexar USB flash driveSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 130MB/s and 0MB/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	128,76	76,78
SEQ1M Q1T1	169,65	76,66
RND4K Q32T16	13,56	2,15
RND4K Q1T1	11,81	1,64