Well... at first, there only were SCSI burners. When the first IDE ones came (2x!) it was both a relieve and a problem at once. As there was no such thing as buffer underrun protection, IDE drives suffered way more of this problem than SCSI drives. With standard systems back then (let's say 300Mhz PII systems), clicking the start menu while burning a disc at 4x would most likely end up in a buffer underrun. SCSI drives also had this issue, but allowed the computer to be used while burning. Okay, too much harddrive or CPU activity would end up in a buffer underrun, but it allowed light usage. I could play Unreal while burning at 4x using my SCSI burner (reading from a SCSI CDROM) on my P2 system.
Also, new (faster) drives were first released for SCSI systems and later on for IDE systems. Besides that, Plextor offered a 40x SCSI CDROM drive back then that just couldn't get beat by any other CDROM (as a matter of fact, it never got beaten!).
So SCSI had some nice advantages:
- hardly any use of the system CPU when active
- no IDE problems like bus interleaving
- saving IDE ports for cheap harddrives
- newest drives with nicest features (like BurnProof)
- allowed many drives on one controller (I had 4 SCSI burners and 2 SCSI CDROMS on a single controller card)
The only bad thing was the price....