What types of hard disk drive are there?

Questions about hard disks' performance, issues, tips, and software.
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What types of hard disk drive are there?

Post by shravan »

IDE (Integrated Drive Electronics) is a standard electronicinterface used between a computer motherboard's data paths or bus and the computer's disk storage devices. The IDE interface is based on the IBM PC Industry Standard Architecture (ISA) 16-bit bus standard, but it is also used in computers that use other bus standards. IDE was adopted as a standard by the American National Standards Institute (ANSI) in November 1990.

The ANSI name for IDE is Advanced Technology Attachment (ATA), and the ATA standard is one of several related standards maintained by the T10 Committee. In today's computers, the IDE controller is often built into the motherboard. Prior to the IDE drive, controllers were separate external devices so IDE reduced problems associated with storage devices and integrated controllers.

SATA (Serial ATA):
(Serial ATA) The standard hardware interface for connecting hard drives, solid state drives (SSDs) and CD/DVD drives to the computer. Introduced in 2001, nearly all computers use SATA drives.
SATA is the faster serial version of the original parallel ATA (PATA) interface. Both SATA and PATA are "integrated drive electronics" (IDE) devices, which means the controller is in the drive, and only a simple circuit is required on the motherboard.

SATA has several practical advantages over the parallel signaling (also called Parallel ATA or PATA) that has been used in hard drives since the 1980s. SATA cables are more flexible, thinner, and less massive than the ribbon cables required for conventional PATA hard drives. SATA cables can be considerably longer than PATA ribbon cables, allowing the designer more latitude in the physical layout of a system. Because there are fewer conductors (only 7 in SATA as compared with 40 in PATA), crosstalk and electromagnetic interference (EMI) are less likely to be troublesome. The signal voltage is much lower as well (250 mV for SATA as compared with 5 V for PATA).

SSD (Solid State Drive):

An SSD (solid-state drive or solid-state disk) is a nonvolatilestorage device that stores persistent data on solid-state flash memory.
Solid-state drives actually aren't hard drives in the traditional sense of the term, as there are no moving parts involved. A traditional hard disk drive (HDD) consists of a spinning disk with a read/write head on a mechanical arm. An SSD, on the other hand, has an array of semiconductor memory organized as a disk drive, using integrated circuits (ICs) rather than magneticor optical storage media.
Development and adoption of SSDs has been driven by a rapidly expanding need for higher input/output (I/O) performance. SSDs have much lower random access and read access latency than HDDs, making them ideal for both heavy read and random workloads. That lower latency is the direct result of the ability of flash SSD to read data directly and immediately from a specific flash SSD cell location. High-performance servers, laptops,desktops or any application that needs to deliver information in real-time or near real-time can benefit from solid-state drive technology.

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