I bought a 32 GB thumb drive (similar to the one below) and copied my wiki on to it using my Windows 8 laptop.
I then plugged it into my HP Envy h8-1414 which has Windows 7 shoe horned onto it.
The drive came up, but as soon as I started to browse deeper than the root directory it froze up, and I couldn't
safely remove it. I yanked it, and then when reconnecting the drive it asked me to scan it and this screwed it up completely. I formatted the drive and it just didn't work at all after that on neither the Envy or the Laptop.
I decided that maybe it was a lemon or something, so I returned the drive and bought a 64GB one that was similar (see below) except the size was larger:
I tried the same process and copied my wiki files over to the new drive using the the laptop and then I tried to make it work on the Envy and got the exact same problem, except that this time when I plugged the drive back into the laptop I was still able to access the files.