IBM 6151 Maintenance And Service Manual page 440

Fixed-Disk Drive Removal
Follow the Handling a Fixed-Disk Drive procedures. If needed, see
Section 8.
1. Do the "Top Cover Removal" on page 4-12.
2. Pull on the latch wire to release the diskette drive, then slide
the drive part way out of the system unit.
3. Pull on the latch wire to release the fixed-disk drive, then slide
the drive part way out of the system unit.
AJZBF027
4-30 Service Manual