eMMC and SD I/O tests

Tests executed with:

Result: best of 3 runs

ext4 FS on eMMC

Result:

F2FS FS on eMMC, without encryption nor compression

Result:

F2FS FS on eMMC, with encryption and no compression

Result:

ext4 on SD card

Result:

ext4 on SD card (Sandisk extreme 128G A2 U3)

Result: