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# Test read/write speed of SD/microSD/USB/SSD/HDD. # Mac - Disk IO speed test
Bash script for Mac OS X and Linux to test SD/microSD card or SSD/HDD/USB drive read and write speed.
Bash script for Mac OS X test SSD/HDD/SDHC or network storage's read and write speeds of devices on or connected to your mac.
Usage: Usage:
``` ```
$ bash sd_card_speed_test.sh <path to directory which should be tested> $ bash storage_speedtest.sh /Volumes/Data/
``` ```
IE: `/Volumes/Untitled` and not `/dev/disk2` i.e., use: `/Volumes/Data` and not `/dev/disk2`
Note: administrator password is necessary for sudo to reset file system cache. Read speed result is incorrect without cache reset. Note: administrator password is necessary for sudo to reset file system cache (using sync & purge command). This is because the Read speed results are incorrect when performed without a cache reset.