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DEFINATION OF SATA :-The full form of SATA is Serial Advanced Technology

Attachment. SATA is a computer bus primarilydesigned for transfer of data between a computer andmass storage devices such as hard disk drives and

optical drives.

It was designed as a successor to the Advanced

Technology Attachment standard (ATA) , and isexpected to eventually replace the older technology.

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ADVANTAGESThe main advantages over the older

parallel ATA interface are faster data

transfer , ability to remove or add devices

while operating , thinner cables that let aircooling work more efficiently , and more

reliable operation with tighter data integrity

checks.

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CABLES

SATA uses only 4 signal lines ; cables are

more compact and cheaper than for

parallel ATA. SATA supports hot-swappingand NCQ (Native Command Queuing).

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eSATA

There is a special connector (eSATA) specified forexternal devices, and an optionally implementedprovision for clips to hold internal connectors firmlyin place.

eSATA defined separate cables , connectors andrevised electrical requirements for externalapplications:-

1. Minimum transmit potential range increased from

400-600 mV to 500-600mV.2. Minimum receive potential range decreased from

325-600mV to 240-600mV.

3. Maximum cable length of 2m.

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SATA AND eSATA CONNECTOR

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Bridged drives have a SATA connector , may include

either or both kind of power connectors, andgenerally perform identically to their parallel ATA

equivalents. During initial period after SATA/150

finalization, adapter and drive manufactures used a

bridge chip to existing parallel ATA designs for use

with the SATA interface. Bridge product graduallygave way to native SATA products.

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POWER connecterThe SATA standardalso specifies a

new powerconnector. Likethe data cable, it iswafer-based, but

its wider 15-pinshape preventsaccidentalmisidentificationand forcedinsertion of the

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wrong connector type. NativeSATA devices favor the SATApower-connector over the oldfour-pin Molex connector,although some SATA drivesretain older 4-pin Molex.

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eSATA cable

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1. At the device level , Serial ATA and Parallel ATA

devices are completely incompatible- they cant beinterconnected.

At the application level, Serial ATA devices arespecified to look and act like parallel ATA devices.

2. In early motherboard implementations of serial ATA,

backward compatibility allowed SATA drives to beused as drop-in replacements for parallel ATA drives,even without native (driver- level) support at theoperating system level.

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4.PCI cards with a SATA connector existthat allow SATA drives to connect tolegacy systems without SATAconnectors.

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DEFINITION OF IDE:DEFINITION OF IDE:--

IDE stands for Integrated Drive Electronics which is aIDE stands for Integrated Drive Electronics which is astandard electronic interface used between a computerstandard electronic interface used between a computermotherboards data paths or bus and the computers diskmotherboards data paths or bus and the computers disk

storage devices.storage devices.IDE interface based on IBM PC industryIDE interface based on IBM PC industry

standard architecture 16 bit bus standard but it is alsostandard architecture 16 bit bus standard but it is alsoused in computers that use other bus standards. Mostused in computers that use other bus standards. Mostcomputers sold today use an enhanced version of IDEcomputers sold today use an enhanced version of IDEcalled Enhanced Integrated Drive Electronics. In todayscalled Enhanced Integrated Drive Electronics. In todayscomputers, the IDE controller is often built into thecomputers, the IDE controller is often built into themotherboard.motherboard.