IBM F50 RS/6000 7025 - Manual (Page 77)

Attention: If you change your startup sequence, you must be extremely careful
when performing
write operations (for example, copying, saving, or formatting). You
can accidentally overwrite data or programs if you select the wrong drive.
The default boot sequence is:
The primary diskette drive
CD-ROM drive
Tape id=5 (slot=1)
Hard disk drive id=6 (Slot=1)
Network device.
To change the custom boot list, enter a new order in the New column, then select
Save. The List of Boot Devices is updated to reflect the order you have chosen.
You can choose 1 to 5 devices for the custom boot list. To change the boot
sequence back to the default values, select Default. (The default sequence is
automatically saved.)
Chapter 3. System Management Services 3-9