How to check the performance of a hard drive (Either via terminal or GUI). The write speed. The read speed. Cache size and speed. Random speed.
Is there something more you want?
I would not recommend using
Another point of view must be the sync time inclusion; all modern filesystems use caching on file operations.
To really measure disk speed and not memory, we must sync the filesystem to get rid of the caching effect. That can be easily done by:
with that method you get output:
so the disk datarate is just 104857600 / 0.441 = 237772335 B/s --> 237MB/s
That is over 100MB/s lower than with caching.