IBM ThinkPad® T40 Series Service And Troubleshooting Manual page 56

Upgrading the hard disk drive
To replace the hard disk drive, do the following:
1. Turn off the computer; then disconnect the ac adapter and all cables
2. Close the computer display, and turn the computer over.
3. Remove the battery.
4. Remove the screw that secures the hard disk drive.
5. Open the computer display; then stand the computer on its side and
6. Detach the cover from the hard disk drive.
7. Attach the cover to a new hard disk drive.
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ThinkPad T40 Series Service and Troubleshooting Guide
from the computer.
remove the hard disk drive by pulling the cover away from the
computer.