25 Mar 2016

Raspberry Pi SD Card Tests

There's an excellent benchmarking post on SD card performance on Raspberry Pi's by Jeff Geerling. These are the results of tests on my SD cards.

I've created a script that runs Jeff's test here.

hdparm is a sequential read test, nice for quick boot
dd write is a block read/write test

Type,Device,hdparm,dd write,4k rand read,4k rand write
USB SSD,WD PiDrive 314,17.93 MB/s,36.3 MB/s,0.466 MB/s,1.5 MB/s
Micro SDHC,16GB Samsung Pro,tbd,tbd,tbd,tbd
USB,128GB SanDisk USB,33.25 MB/s,21.7 MB/s,2.53 MB/s,1.53 MB/s
USB,64GB Trascend USB,35.56 MB/s,15.2 MB/s,4.08 MB/s,0.62 MB/s
Micro SDHC,32GB Samsung EVO,20.17 MB/s,15.0 MB/s,8.61 MB/s,3.05 MB/s
Micro SDHC,8GB SanDisk,21.64 MB/s,9.8 MB/s,7.51 MB/s,0.76 MB/s
Micro SDHC,32GB GSkill,20.6 MB/s,16.3 MB/s,4.0 MB/s,0.6 MB/s
Micro SDHC,16GB Samsung EVO,9.82 MB/s,11.7 MB/s,,
Micro SDHC,32GB SP,17.83 MB/s,10.3 MB/s,2.5 MB/s,0.25 MB/s