Solid state drives (SSDs) are faster than conventional hard disk drives (HDDs) and they are also more reliable and use less power. A standard SSD can read sequential data at a speed of about 550 megabytes per second (MBps) and write it at 520 MBps. In contrast, a fast HDD may carry out sequential reads and writes at just 125MBps.

A USB2 gives 200 iops and USB3 gives 750 iops

We recommend a standard USB3 connection for a compliance library as a USB3 connection is always better and will provide faster scan speeds.

Hence USB3 and SSD is the optimal solution for a compliance library as they are capable to provide better scan speed while lots of reads and writes happens with more number of DB transactions.