Both are connection types for hard drives (in the case of SCSI, other
devices can also be connected). Of the two, SCSI is by far the older
standard, and hardware for this is more expensive (although often a lot
faster). IDE is the nominal standard hard drive connection found on most
motherboards these days, although the new SATA interface is becoming more &
more popular. I'd lay long odds that your PC uses IDE connections...
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