TrueCrypt will encrypt, and password protect them. I believe the best practice is to encrypt a folder, and leave the drive unencrypted

with the app you must have to access the secure part in the unsecured section.

That may take it further than you wanted, but the data would be safe.

No, the app is what requires the password.

I have several friends who use it and say they really like it, although I have not used it.

k.... thanks