Types
SCSI host adapters traditionally fall into two broad classes:
- Simple, relatively low-performance cards that provide an inexpensive way to connect SCSI devices that do not demand a great deal of bandwidth: notably CD-ROM drives and SCSI scanners. The cost varies but is typically in the order of $US40 or so. These were very common up until about 2000, but are now fairly rare: the demise of the ISA slot added a little to the cost; the great improvement in IDE technology (particularly in the case of CD-ROM drives and CD recorders) removed one major use, and the advent of USB made the expense of a SCSI interface unnecessary for most scanners.
- High-end cards designed for maximum performance, usually for very high-speed hard drives, and especially for situations that require several high-speed drives (notably servers). These are almost always quite expensive, around $US200 or more. The advent of serial ATA is expected to reduce the usage of high-end SCSI host adapters, but there is no current expectation that they will disappear in the near future.
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