TEST: SanDisk Ultra Flair 256GB USB flash drive

Technical data
Image
Manufacturer	SanDisk
Model number	SDCZ73-256G-G46
Storage capacity	256 GB (233 GiB)
pSLC-Cache	1 GB approx.
Read speed	150 MB/s
Write speed	60 MB/s
Connection	USB Typ A
Price	ca. 20 USD (= 0,08 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

14 %

Write speed

6 %

*) 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 35 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	148,38 MB/s	24,87 MB/s
4K in megabytes per second	4,87 MB/s	0,64 MB/s
4K-64Thrd in megabytes per second	3,87 MB/s	0,30 MB/s
Access time in milliseconds	0,824 ms	36,083 ms
Score	24	3
Total score	35

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 24, 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	26,03 MB/s	41,25 s
Program many small files	15,10 MB/s	93,15 s
Game small and large files	20,11 MB/s	68,66 s

Compression Performance Test

This measures the write and read speed of the SanDisk USB flash drive, depending on the compressibility of the data (according to the manufacturer, these should be 150 MB/s and 60 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	156,86	60,59
SEQ1M Q1T1	156,94	55,91
RND4K Q32T16	6,55	1,04
RND4K Q1T1	5,95	0,81

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 4 GB was written to the medium. After approx. 1 GB, the pSLC-Cache was full and the performance was throttled.
At least the test file could be read with an average write speed of 37 MB/s and written with 8 MB/s.

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 were written and read.

SSD-Z Benchmark

Similar to HD Tune, a 500 MB file is written to the 256 GB SanDisk USB flash drive here. The transfer data is displayed. The more constant the line, the better.

The benchmark test was performed on December 24, 2020.
Information about the test system can be found at the bottom of the home page.
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