I encrypted my external hard drive using Linux Mint (Ubuntu) and password protected it. Now I can't access it on Windows 7 as it gives errors and won't mount. Is there a software that will allow me to read from this device? Note: I'm not sure exactly which algorithm was used to encrypt the drive but it was the standard option in Linux Mint (Ubuntu) and it sounded universal, but apparently not. Thanks!
Check out FreeOTFE
I am pretty sure that Ubuntu / Mint uses dm-crypt with Luks and AES-Algorithm as standard for /home encryption as most modern CPUs support AES natively and thus it is very fast (faster than read/write of the harddrive).
FreeOTFE seems to be able to read all of the supported modes, so you might give it a shot. I never used it myself so no guarantee.