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In terms of cost, the IDE/ATA interface is superior to the SCSI interface in virtually every way. The only exception would be if you needed to use, say, 10 devices, in which case SCSI might be cheaper because this would require a special solution to do in IDE/ATA. I am assuming that nobody would use IDE/ATA for that many drives anyway.
Here are four specific reasons why SCSI is more expensive than IDE/ATA (there are probably others as well):
For those for whom cost is an important consideration, IDE/ATA will win over SCSI virtually every time. For low-end systems, the extra funds required to go to SCSI will usually be better spent upgrading core parts of the system such as the processor or system RAM. This is important to remember: those building performance systems should make sure they have addressed proper component balance and adequate system memory and other key components before making the jump to SCSI.