There are a matter of few differences between these two things. I hereby explain.
IDE has a higher CPU load.
SCSI has a lower CPU load and allows more devices to be connected.
Because of the lower CPU load, hence less dependency on CPU, it is a more stable connection. It depends on the kind of SCSI connection compared to the kind of IDE connection (generally speaking) if either one has a higher transfer rate (wouldn't be fair to compare UDMA33 with SCSI160)
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Linear Mode
