Drives use the Small Computer System Interface set of standards to communicate with computers and transfer data. Commonly pronounced "scuzzy," these drives are particularly suited for server environments due to their speed. Many computers use them or support them, however, as the technology is backwards compatible even as it evolves. The drives come in both internal and external versions, though the usage for each type will generally be somewhat different. Internal drives are typically expected to serve as permanent storage for a system, while external drives are more easily connected to other computer systems.
Apple Macintosh and Sun Microsystems used scsi drives as early as 1987, which was when the technology became standardized. Commodore also used sc si drives in its Amiga line of computers, which upgraded the Commodore 64 model and was an attempt to compete against the more expensive Apple line of computers. Commodore left the consumer PC market, but Apple remained, continuing to provide support for newer systems until the manufacture of the latest iMac models. Interfaces continue to be available on a variety of other systems, including Mac, Microsoft Windows and Linux configurations, though newer systems provide support in a slightly different way in recent years.
The Latest Technology
Technology in computers today is often seen as SAS, which is the acronym for Serial Attached sc si . This technology replaces the older parallel protocol. There is a trade association, that exists to promote awareness of various technologies and their uses. The association provides information about assorted products and holds events to showcase them.
SC SI Express
One of the latest products to emerge is SC SI Express, which combines the technology with PCIe, the high speed replacement for AGP, PCI, and PCI-X bus standards. The hope is that this technology will lead the way toward storage solutions based on PCIe expansion. Ideally, SC SI Express and drive for SAS would coexist in hardware configurations, allowing the expansion slots to extend high performance storage.
Though some server configurations now have RAIDs that use SATA drives, a great number have traditionally used sc si drives, and many still do. RAID technology, Redundant Array of Independent Disks, provides a means to increase storage capacity and allow for mirroring, preserving data in the event of disk failure. SC SI drives in a RAID array also operate such that they functionally appear as a single disk, but have the capacity of multiple disk drives.
For home and small business computer users whose hardware supports SC SI, there are options available. A ribbon connector allows the attachment of an internal device to the controller, while external drives use cables for connectors. Buyers will need to check the device and computer to determine the exact cables needed, but most external drives will have female connectors, while the cables will have two male ends. Internal drives are commonly found with specifications of 7200 rpm speed and up to two terabytes of disk space available.