Lenovo ThinkPad SL400c Hardware Maintenance Manual page 44

5. Select HardDisk Security Setting and press Enter. Hard Disk x Password,
6. Select Change HDD Master Password by using the cursor directional keys.
7. Type the current master HDP in the Enter CURRENT Password field. then
8. Press F10.
9. Select OK in the Setup Configuration window.
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ThinkPad SL400, SL400c, SL500, and SL500c Hardware Maintenance Manual
where x is the letter of the hard disk drive.
leave the Enter New Password field blank, and press Enter twice.
Both user HDP and master HDP will have been removed.