Seagate Maxtor OneTouch FireWire User Manual page 23

MAXTOR ONETOUCH III MINI EDITION WINDOWS VISTA INSTALLATION
3. In the Confirm Password box, re-enter your password.
4. Click OK.
Note: If you've already encrypted this file before, the previously
encrypted version remains on your computer. You are asked for
permission to replace the existing version with this more current
version. Click Yes to confirm replacement.
At this point, The Encryption window briefly displays the progress of the
encryption.
When the window closes, an encrypted version of the file appears. To
maintain security, delete the original, unencrypted version of the file.
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To Decrypt a File
1. Double-click the encrypted file
or
Right-click on the file and select Decrypt from the dropdown menu:
The Maxtor Decryption Window opens.
2. Enter the password for the encrypted file.
3. Click OK.
Note: If an unencrypted file with the same name exists in the location
to which you are decrypting, you're asked for permission to replace
the existing version with this more current version. Click Yes to
confirm replacement.