hard disk interfaces
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Related to hard disk interfaces: Hardware interfaces
hard disk interfacesMost hard disks use the Parallel ATA (PATA), Serial ATA (SATA) or SCSI interfaces. SCSI drives have traditionally been found on servers and high-performance workstations and were the first drives used in fault-tolerant RAID systems. Today, ATA drives are widely used for RAID arrays.
Following are the major types, including older ones for comparison. Most hard disks use the run length limited (RLL) encoding method; however, the encoding is not necessarily prescribed by the interface. See IDE, PATA, SATA, SCSI, RAID, RLL and hard disk.
HARD DISK INTERFACES Transfer Rate (MB per Max.Type Encoding** sec) Storage SATA/ IDE RLL 150-600 10TB PATA/ IDE RLL 3-133 1TB SCSI RLL 5-320 1TB SAS RLL 375-750 10TB CapacityOlder Interfaces Range IPI RLL 10-25MB 200MB-3GB ESDI RLL 1-3MB 80MB-2GB SMD RLL 1-4MB 200MB-2GB IDE RLL 1-8MB 40MB-1GB ST506 RLL RLL 937KB 30MB-200MB ST506 MFM 625KB 5MB-100MB
|The First RAID System|
|Using SCSI disks, this prototype was built by University of Berkeley graduate students in 1992. Housing 36 320MB disk drives, the total storage of this entire rack was a whopping 11GB. See RAID. (Image courtesy of The Computer History Museum, www.computerhistory.org)|
|Twenty Five Years Later|
|In 2017, this single 10TB hard drive had 900 times as much storage as the 36 drives in the Berkely system above.|