Lenovo ThinkServer RD240 Software User's Manual page 280

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Figure 8.22 Change Security Settings - Security Key Screen
7. Click Use the existing drive security key to use the existing drive
security key or enter a new security key and then enter the new
security key again to confirm.
Attention: If you forget the security key, you will lose access to
your data. Be sure to record your security key information.
You might need to enter the security key to perform certain
operations.
The security key 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.
Note: Non-US keyboard users must be careful not to enter DBCS
characters in the security key field. Firmware works with the
ASCII character set only.
8. Click Next.
The Authenticate Drive Security Settings Screen appears, as shown
in Figure 8.23. Authentification is required for the changes that you
requested to the drive security settings.
Configuration