There were moving a drive from PC to USB case and back and learned that they were corrupting the hard drive contents.
Such movement is not supported or supportable.
Put the drive where you will use it, then delete the partitions (Data will go by-by), create the partition and format it. If you take it out of the USB case, and attach it to a PC IDE cable, then repeat...
I've cut and pasted about 20GB worth of files onto a new external HD, but when I try and move (copy/cut) or open any of them I get messages to the "We can't find what you're on about" effect.
Moving from HD to main HD desktop: "Cannot copy 'blah' Cannot find the specified file"
Open in Word "The document name or path is not valid."
But when i'm in Windows Explorer I can see everything with correct name, sizes, types and modification dates; but can't physically do anything with the files, in the way of opening them, moving them etc.