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| Home: Online Courses: Computer Courses: A+ Hardware: Computer H/W, System Boards, Storage Devices |
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A+ Hardware Service Technician: Computer Hardware, System Boards, and Storage Devices
SCSI (Small Computer Systems Interface) is another standard for hard drive connection. SCSI also has a variety of other peripherals and storage devices which can take advantage of it. SCSI comes in three varieties: SCSI 1, SCSI 2, and SCSI 3. SCSI 1 supports up to 8 devices, 1 of which is required to be the controller card (so you can add 7 additional devices to the controller). Unlike normal IDE or EIDE systems, most SCSI devices come in internal or external varieties and most cards can support both. SCSI 2 (also known as Ultra-2), which is more popular than SCSI 1, supports up to 16 devices (one of which has to be the adapter card or controller) and supports a higher transfer speed. SCSI 3 is sometimes referred to as Ultra-3 SCSI. Ultra-3 SCSI increases the throughput rate of the interface from 80 Mbps to 160 Mbps. The new standard for this transfer rate is referred to as Ultra160/M.
A SCSI chain (all of devices on a controller) must have a terminator at both ends. The SCSI card often has a built-in terminator and a lot of present day SCSI devices also have a switchable termination on the drive or device. SCSI drives are typically more expensive than EIDE drives, but have higher access speed and allow for more devices on one controller.
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