Recently we have noticed an issue when transferring data between mechanical drives and the Glyph Studio Raid external device. Specifically the issue pertains to large folders with numerous subfolders. In our initial testing it would appear that the data size is irrelevant beyond a few GB and mostly revolves around the number of subfolders.
How to find out if your drive is failing
At Puget Systems, we use a couple free drive diagnostic tools to tell us if there are issues with solid state drives and hard disk drives. Some of the programs that will be summarized include disk error checking tool, Samsung Magician, and Crystal Disk Info.