SDCard Testing

From OLPC
Jump to navigation Jump to search

This page discusses additional tests for SD Cards. The 'base' tests are described in NAND_Testing.


Results

Segment size vs throughput.

The first and last examples are based on numbers provided by Arnd Bergmann

Size Sample High perf card SanDisk C2 4GB uSD "A" Toshiba C2 4GB uSD "B" Unusable card
4MiB 8.86M/s 3.14M/s 5.84M/s 15M/s
2MiB 6.3M/s 4.09M/s 3.6M/s 9.47M/s
1MiB 5.02M/s 2.84M/s 2.21M/s 4.47M/s
512KiB 5.16M/s 1.33M/s 1.3M/s 1.61M/s
256KiB 4.69M/s 868K/s 701K/s 849K/s
128KiB 3.78M/s 556K/s 363K/s 441K/s
64KiB 4.62M/s 297K/s 186K/s 226K/s
32KiB 2.71M/s 155K/s 92K/s 115K/s
16KiB 2.38M/s 76K/s 47K/s 57K/s
8KiB 1.24M/s 38K/s 23K/s 23K/s
4KiB 907K/s 19K/s 11.8K/s 8K/s