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Understanding SCSI, ATA, SAS and SATA



Short for small computer system interface, a parallel interface standard used by all Server class systems. It supports Windows, Apple Macintosh and many UNIX systems for attaching peripheral devices to computers. SCSI interfaces provide for data transmission rates up to 80 megabytes per second. In addition, you can attach multiple devices to a single SCSI port, so that SCSI is really an I/O bus rather than simply an interface. SCSI drives are hot-swappable and pluggable.


It is also called as IDE, is a disk drive implementation that integrates the controller on the disk drive itself. ATA is used to connect hard disk drives, CD-ROM drives and similar peripherals and supports 8/16-bit interface that transfer up to 8.3MB/s. The next version of ATA supports up to 100MB/s.

SATA [Serial SATA]

Serial Attached SCSI, is an evolution of parallel SCSI. SAS is a performance improvement over traditional SCSI because SAS enables multiple devices up to 128 of different sizes and types to be connected simultaneously with thinner and longer cables. It is a full-duplex signal transmission supports 3.0GB/s.  SAS drives also are hot-swappable and pluggable.
SATA [ Serial ATA ]

Normally every one called SATA, Serial ATA is an evolution of the Parallel ATA physical storage interface. It

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