Panasonic CF-18 Series Reference Manual page 62

Hard Disk Drive
Inserting the hard disk drive
Slide the hard disk drive inward until it is firmly in place.
CAUTION
Be sure to insert the hard disk drive as illustrated.
Close the cover, then lock it by sliding the latch to the left.
CAUTION
Confirm that the latch lock is correctly in place. If you carry your
computer without the latch lock in place, the hard disk drive may
fall out.
4
Insert the battery pack.
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