In short, ATA is an interface type
for communicating with storage devices such as hard disks, CD-ROMs, DVD drives, and
so on. ATA and SATA devices are relatively inexpensive and have become competitive
with SCSI devices in terms of performance.
SCSI is usually associated with server configurations. Originally, it significantly
outperformed ATA and provided options for RAID configurations that ATA-type drives
couldn??™t offer. These days, SATA drives rival SCSI drives as far as performance. The one
downside is that SATA controllers are generally limited in the number of drives they
can support.
nNote SCSI, contrary to popular belief, has nothing to do with RAID specifically, nor does SATA. RAID is
implemented either as a feature of the operating system or the disk controller itself. Plenty of SATA controllers
out there don??™t support hardware-level RAID. The same can be said??”but far less often??”of SCSI
controllers. ATA and SCSI are simply specifications for how to communicate with devices??”nothing else.
In common conversation, we sometimes talk of SCSI and RAID as being almost synonymous, but that
isn??™t the case.
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