IBM F50 RS/6000 7025 - Manual (Page 210)

Installing a SSA Backplane in Bank D, or E
Notes:
Banks C, D, and E support hot-swappable drives only.
Before installing SSA disk drives in bank C, you must use FC3006 to
move the SCSI ultra boot disk drive to the media bay.
Before installing SSA disk drives in bank C, D, or E, you must also order
and install a SSA disk drive backplane at the rear of bank D or E. You
must order and install a SSA adapter. To order, contact your authorized
reseller or marketing representative.
After the backplane is completely installed, you do not have to turn off the
server to install additional hot-swappable drives. However, you must turn
off the system when performing the steps that involve installing or
removing backplanes, cables, adapters, memory, and CPU cards
5-66 IBM RS/6000 7025 F50 Series User's Guide