Probably the Q/P630 IDE interface lacks support for removable media due to a restricted driver living in the machine's ROM (like in the PB150 and PB1400). To check if the media connected to the IDE host adapter is operational for the Mac, boot the machine from a CD or external drive into Mac OS 8.1. The System will overwrite the IDE driver with a more capable version, and the System is equipped to mount different formatted drives. In case the IDE flash drive shows up on the Finder desktop, you can reformat it to Apple HFS and configure it as a startup volume. If this works, you will be able to _restart_ the machine to boot from the new drive.
Annotations
1. Most likely the Apple drive setup programme will not want to format the unknown drive, so use guidance for a little ResEdit hack to fix this (to be found in this forum) or use some third party formatter.
2. In case it is possible to _reboot_ the Mac from System 8.1 using the internal IDE drive as a startup volume, but the Mac will not cold boot using this drive after a shutdown, you will need a different kind of media (industrial grade CF / UDMA support will identify as "fixed media" type to mount). PB150 and PB1400 do not accept removable media as a startup volume connected to the internal IDE interface, Q/P630 might not do, as well.
3. Do not try to use other formats than HFS for the purpose as a startup volume. You might have several HFS partitions on that drive, but with any HFS+ partitions on it, it will not be usable as a boot volume for this Mac anymore.
4. In case there is no need to boot the machine often (server), you could configure a CD ROM to boot from with a little AppleScript programme in the startup items folder to perform an automatic restart from an internal CF drive. The startup items folder on the internal drive in return will switch back to boot from CD ROM. Even a forced restart will safely trigger this boot sequence, as long as the system is not corrupted.
Annotations
1. Most likely the Apple drive setup programme will not want to format the unknown drive, so use guidance for a little ResEdit hack to fix this (to be found in this forum) or use some third party formatter.
2. In case it is possible to _reboot_ the Mac from System 8.1 using the internal IDE drive as a startup volume, but the Mac will not cold boot using this drive after a shutdown, you will need a different kind of media (industrial grade CF / UDMA support will identify as "fixed media" type to mount). PB150 and PB1400 do not accept removable media as a startup volume connected to the internal IDE interface, Q/P630 might not do, as well.
3. Do not try to use other formats than HFS for the purpose as a startup volume. You might have several HFS partitions on that drive, but with any HFS+ partitions on it, it will not be usable as a boot volume for this Mac anymore.
4. In case there is no need to boot the machine often (server), you could configure a CD ROM to boot from with a little AppleScript programme in the startup items folder to perform an automatic restart from an internal CF drive. The startup items folder on the internal drive in return will switch back to boot from CD ROM. Even a forced restart will safely trigger this boot sequence, as long as the system is not corrupted.