Hüseyin YARGIÇ
SATA addresses the limitations of Parallel ATA by more than doubling cable length to 1 meter and using data cables comprised of only seven conductors--a pair of differential signal lines for transmitting and another pair for receiving, and a ground between and at each end of the transmission and reception pairs [1]. Sata is better than paralel ata(IDE) because when using sata interface we uses only 7 pin cable so there is no more wide cables which are blocking air flowing in the case and Sata interface's signal quality is better than PATA, so it can transmit signals up to the 90cm which is nearly two times greater than PATA and it provides more cool case interior also it can be used for external connection of hdd's and optical drives [1]. The small number of conductors incorporated by SATA for data transmission also facilitates the deployment of backplanes for external RAID. A backplane is a physical board that is typically integrated to the backend of an enclosure [2]. The first generation of SATA offers a bandwidth of 1.5Gbps using 10-bit signaling per byte of data i.e., equivalent to a data bandwidth of 150MB/sec. The SATA roadmap envisions two succeeding generations--SATA II and III--to be completed at approximately three-year intervals with each generation doubling the bandwidth over the preceding one [2]. Parallel data transfer (sending data along a number of parallel routes) has always meant a large number of wires and high frequency signals prone to electrical interference. Serial ATA follows in the footsteps of other successful standards that are also based on the principle of serial data transfer. Ethernet, USB, FireWire and other technologies, such as AMD's Hyper Transport, are all serial technologies, some of which boost data transfer speeds even further by channel bundling [3]. SATA is being adopted by all major Parallel ATA device vendors (though the adoption by optical drive vendors is slower than anticipated.) Hence, the choice of devices available to users of SATA will be fairly extensive, and the cost of such devices is no higher than Parallel ATA [3].
1. http://www20.tomshardware.com/storage/20020812/index.html
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