I have an HTPC at my living room and it has a 3TB Western Digital portable hard-drive that stores all my media files. The HTPC is running Windows 7 32bit.
Yesterday I connected the hard drive to my laptop running Windows 7 64bits and copied 102GB of data in several files (each not exceeding 1.2GB in size) onto the HD. When I was done, I safely removed the hard drive from the laptop and connected it to the HTPC, but I couldn't find the folder I've just copied - it seems like I copied nothing (all other files that were previously there remained untouched)
What could be the problem? I suspect it has to do with the OS change (32bit vs 64bit) but I have no clue of how to fix this. I can see the folder in the laptop if I reconnect my hard drive to it.