SMALL COMPUTER SYSTEM INTERFACE (SCSI), These are quite similar to IDE hard drives, but these make use of parallel interface standards developed by the American National Standards Insitute (ANSI) for attaching devices to computers., C-LOOK ALGORITHM, is an improvement of C-SCAN. Unlike C-SCAN, which moves from the beginning of the disk to its end (even if there are no additional requests near the end), the head moves forward until it finds the request with the larger cylinder number., CIRCULAR SCAN (C-SCAN), is very similar to SCAN but with a minor change. The head starts at one (1) end (usually at the beginning of the disk) and, while moving to the end of the disk, handles all the requests it finds., NAS, It represents a different approach to storing data in the network. In NAS, the storage resources are connected directly to the network, unlike SAN where the storage resources are part of the network., PARALLEL ADVANCED TECHNOLOGY ATTACHMENT (PATA), These were the first types of hard disk drives that made use of Parallel interface standard to connect to computers., STRIPED ARRAY, It uses a slightly different approach in which a file segment to be stored is divided into blocks., SERIAL ADVANCED TECHNOLOGY ATTACHMENT (SATA), These hard drives have replaced the PATA drives in desktop and laptop computers., SERIAL ATTACHED SCSI (SAS), It is a new technology of hard disk attachment..

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