IBM H SERIES RS/6000 - Manual (Page 125)

2. Loosen the retaining screws that hold the disk drive cover to the drawer and
remove the disk drive cover from the drawer, storing it in a safe place.
Attention: Physically removing a hot-swap drive from the CPU Drawer before it
has been removed from the system configuration may cause unrecoverable data
corruption.
3. Verify that the device has been removed from the system configuration; the
yellow LED on the hot-swap disk drive should be off.
Chapter 5. Installing Options 5-13