Test Read & Write Speed of an External Drive or USB Flash Key
If you need to know the disk performance of an external drive, you can easily go about testing the read and write speed of any such drive by using several third party apps. We’ll cover two, the first is aptly named Disk Speed Test, and the second is called Xbench. Either will work to determine the read/write speeds of any drive, though we’re going to focus specifically on external devices, including USB flash thumb drives, standard USB external hard drives, a Thunderbolt based external disk, firewire, or even network volumes.
This can be helpful for benchmarking the performance of external volumes for Time Machine backups, RAID setups, or even just to find out if an external USB flash key drive is fast enough to run a game or app from.
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