Why can't I boot from an external scsi drive?

In a previous post, I mentioned that my hard drive died. While trying to find ways to work around it, I dug out an old 4 GB SCSI drive I used to use with my old Mac, and hooked it up. When I booted from the OS 10.3 install disk, I was aboe to install the OS on the external drive, and choose it as the startup drive before rebooting. When I rebooted, however, the Mac could not see the SCSI drive as a startup drive. I tried it several times, changed the SCSI ID, erased the drive and reloaded the OS, repaired the directory with Disk Warrior, all with the same results.
What am I doing wrong?
Dave

What model SCSI card do you have installed? Some cards are driver-based, like the Adaptec 2906. Its driver is loaded from the boot drive, as the extensions are displayed across the screen during the startup process. As such, drives connected to that type of card can't be designated as the boot device. A newer SCSI card that's firmware-based, like the Adaptec 2930, can be used for booting the computer. If you have a card that's firmware-based, then you may need to update the firmware with a newer (Mac OS X) compatible version.

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