Controllers and Host Adapters

Hard disks interface to computers via components known as controllers or host adapters. (The former term is usually applied to ATA interfaces, whereas the latter applies to SCSI interfaces.) Until the mid-1990s, these devices were usually separate cards that plugged into motherboards. Today, though, all new IA-32 motherboards ship with ATA controllers built in, and some motherboards include SCSI host adapters, as well. Even when a motherboard includes a controller or host adapter, though, you may want to add another one or replace an existing one.

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