SCSI
For a long time, there was quite simply nothing better than SCSI. It was everything IDE wasn't: fast, stable and reliable, plus it offered RAID functionality, which wasn't really practical with early IDE drives.
It was SCSI disks that made the early Macs suck considerably less than their cloned IBM counterparts. While everyone was struggling to load Windows 3.11 off a crazy-slow IDE 5,200rpm drive, Mac users were enjoying the productivity afforded them by drives with much quicker data transfer rates and which could be daisy-chained in far greater numbers than IDE.
SCSI wasn't perfect, and if we're totally honest, termination and device IDs are the work of the dark lord Beelzebub himself. These days, SATA has done for SCSI by being cheap, supporting RAID easily and allowing hot-swapping of drives. Don't worry though, because all the current formats will be seen off by InfiniBand anyway.
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