Before we get deep into testing how fast or slow an external drive or USB flash drive is, let us first deal with the basic facts. Internal drives by design are much faster than external drives. That said if you plan to use an external disk as a replica for your internal disk. You should not expect the same performance.
Nonetheless, it is important to establish the write and read speed of an external drive so that you can weigh if it will be able to run the app or game you would like to install. The trick shared below is for Mac OS X users (this time round, sorry to our Windows users).
We are going to establish the read and write speed for USB flash thumb drive, and the standard USB external hard diskS, A Thunderbolt-based external disk, firewire, and even network volumes.
PS: If you want to decide between two or more external storage for backing up your Mac using Time Machine, or for RAID setups. This procedure will go a long way in helping you determine which one has the fastest read and write …read more