Lenovo 9443XAU - ThinkPad Z61t 9443 Hardware Maintenance Manual page 32

Related service information
Also, the computer goes into hibernation mode automatically in either of the
following conditions:
v If a "hibernation time" has been set on the timer, and if the user does not do
v If the timer conditions are satisfied in suspend mode.
When the power is turned on, the computer returns from hibernation mode and
resumes operation. The hibernation file in the boot record on the hard disk drive is
read, and system status is restored from the hard disk drive.
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MT 8747, 8749, 9440, 9441, 9442, 9443, and 9448
any operation with the keyboard, the TrackPoint, the hard disk drive, the
parallel connector, or the diskette drive within that time.