If you think that the storage device has poor performance, first you need to get data on linear read speed, disk access time, and IOPS (I/O operations per second) for the data storage device in question.
All this information can be collected with the help of any benchmark tool for storage devices. There exist paid and not benchmark software. I used free and easy-to-use benchmark software - BenchMe that shows linear read speed in real time. The free benchmark tool also produces a chart with distribution of access time determined for the storage device. BenchMe displays features the data storage device supports as well.
On the developer's site one can find sample benchmark charts made by BenchMe for various data storage devices - typical hard drives, SSDs, and RAID arrays.
The only disadvantage I come across is that the tool doesn't handle hard disks connected via USB.
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