Editing Host adapter (section)

==SCSI==
A '''{{vanchor|SCSI host adapter}}''' connects a host system and a peripheral [[SCSI]] device or storage system. These adapters manage service and task communication between the host and target.<ref name="techtarget" /> Typically a [[device driver]], linked to the [[operating system]], controls the host adapter itself.

In a typical [[parallel SCSI]] subsystem, each device has assigned to it a unique numerical ID. As a rule, the host adapter appears as SCSI ID 7, which gives it the highest priority on the SCSI bus (priority descends as the SCSI ID descends; on a 16-bit or "wide" bus, ID 8 has the lowest priority, a feature that maintains compatibility with the priority scheme of the 8-bit or "narrow" bus).

The host adapter usually assumes the role of [[SCSI initiator]], in that it issues commands to other SCSI devices.

A computer can contain more than one host adapter, which can greatly increase the number of SCSI devices available.

Major SCSI adapter manufacturers are [[Hewlett-Packard|HP]], [[ATTO Technology]], Promise Technology, [[Adaptec]], and [[LSI Corporation]]. LSI, Adaptec, and ATTO offer PCIe SCSI adapters which fit in Apple Mac, on Intel PCs, and low-profile motherboards  which lack SCSI support due to the inclusion of SAS and/or SATA connectivity.