A while ago, my computer died. It was quite old and it was probably due. 
The hard drive (thankfully) was OK though, and I bought an external housing to put it in so I could hook it up via USB to my new computer. This has been working fine.

Today though, it does not seem to work :(

I have a couple of other external USB drives, and I wonder if it is because last night I placed a drive on top of this other external drive when i was using it? Like could the magnetic field from one drive wiped out data when placed on another drive?

I just can't seem the access the old drive any more.