TEST: Lexar JumpDrive M400 128GB USB flash drive

Technical data
Image
Manufacturer	Lexar
Model number	LJDM400128G-BNBNG
Storage capacity	128 GB (116 GiB)
Read speed	150 MB/s
Write speed	not specified
Connection	USB Typ A
Price	ca. 19 AUD (= 0,15 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

15 %

Write speed

17 %

*) 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 0 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	158,81 MB/s	120,81 MB/s
4K in megabytes per second	2,48 MB/s	0,22 MB/s
4K-64Thrd in megabytes per second	0,00 MB/s	0,10 MB/s
Access time in milliseconds	0,000 ms	0,000 ms
Score	0	0
Total score	0

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 July 24, 2024 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	46,54 MB/s	23,08 s
Program many small files	9,68 MB/s	145,37 s
Game small and large files	16,66 MB/s	82,90 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 150MB/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	165,25	119,84
SEQ1M Q1T1	165,88	98,66
RND4K Q32T16	7,84	1,41
RND4K Q1T1	7,71	0,77