TEST: SanDisk Ultra 256GB USB flash drive

Here you can find a detailed performance and benchmark test of the USB flash drive Ultra with 256GB (SDCZ48-256G-U46) from SanDisk.

Score
0

Price/GB
0,08 €

Technical data
Image
Manufacturer	SanDisk
Model number	SDCZ48-256G-U46
Storage capacity	256 GB (233 GiB)
Read speed	100 MB/s
Write speed	30 MB/s
Connection	USB Typ A
Price	ca. 21 USD (= 0,08 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

17 %

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 0 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	167,58 MB/s	66,34 MB/s
4K in megabytes per second	0,00 MB/s	0,05 MB/s
4K-64Thrd in megabytes per second	0,00 MB/s	0,00 MB/s
Access time in milliseconds	0,000 ms	0,000 ms
Score	0	0
Total score	0

With an AS SSD total score of 0 (zero), the AS SSD benchmark could not be completed. The reason for this is that the 4K values were extremely poor - around 0.01 MB/s - so the benchmark tool would need days to pass the 1 GB test. Such USB memory sticks are not suitable for everyday use and it is better to invest a little more in a drive with better 4K rates.

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 January 19, 2021 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	35,36 MB/s	30,37 s
Program many small files	25,17 MB/s	55,89 s
Game small and large files	17,79 MB/s	77,61 s

Compression Performance Test

Here, the writing and reading speed of the the SanDisk USB flash driveSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 100MB/s and 30MB/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	157,59	52,78
SEQ1M Q1T1	157,29	58,92
RND4K Q32T16	8,35	1,70
RND4K Q1T1	8,09	1,34

Input/Output operations per second

CDM	Read [IOPS]	Write [IOPS]
SEQ1M Q8T1	150,30	50,30
SEQ1M Q1T1	150,00	56,20
RND4K Q32T16	2.038,60	414,60
RND4K Q1T1	1.974,90	326,70

Average latency

CDM	Read [µs]	Write [µs]
SEQ1M Q8T1	52.894,20	125.116,00
SEQ1M Q1T1	6.656,26	17.778,70
RND4K Q32T16	226.830,00	492.133,00
RND4K Q1T1	505,91	3.059,49

HD Tune Pro Benchmark

HD Tune writes a 1 GB file to the 256 GB SanDisk 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 256 GB SanDisk 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 January 19, 2021.
Information about the test system can be found at the bottom of the home page.
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