Lenovo ThinkServer RD240 Software User's Manual page 139

Figure 4.36 Enable Drive Security – Enter Pass Phrase
8. If you want to use a pass phrase, click the checkbox Use a pass
phrase in addition to the security key.
9. Enter a new pass phrase and then enter the new pass phrase again
to confirm.
The pass phrase is case-sensitive. It must be between eight and
thirty-two characters and contain at least one number, one lowercase
letter, one uppercase letter, and one non-alphanumeric character
(e.g. < > @ +). The space character is not permitted.
Non-US keyboard users must be careful not to enter DBCS
characters in the pass phrase field or security key field. Firmware
works only with the ASCII character set.
10. Click Accept.
The Confirm Enable Drive Security screen appears, as shown in
Figure 4.37.
Selecting Full Disk Encryption Security Options 4-63