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experienced DIYer should be aware of the hard disk transfer speed has been the internal hard disk transfer rate, rather than external interface transfer rate. However, since the perpendicular recording technology is fully applied, the disk recording density continues to increase the transmission performance of the mainstream hard drive had more than 100MB / s, PATA parallel can not meet the actual demand. The physical design of the interface, large PATA interface and wire have been affected to some extent the cooling air duct inside the chassis, shorter length of wire PATA cable management reduces the flexibility, combined with the absence of any hot-plug capacity, PATA has been eliminated is a virtual certainty.

10 个 SATA ports, PATA, then change for the space to share several times larger
on the transmission, SATA is point to point serial transmission, each SATA device can monopolize all the bandwidth of a SATA channel, to avoid the PATA parallel transmission grab two devices on a channel bandwidth problems and jumper trouble; transmission speed, SATA from 1.5Gb / s (150MB / s), 3.0Gb / s (300MB / s), to the latest 6.0Gb / s, the highest ratio of PATA 133MB / s to be much higher. Some friends on the transfer rate can be very confusing, for example, SATA 3.0Gb / s transfer speed Why is 300MB / s? This is because the SATA is used as 8b/10b encoding, this mechanism practical for the 8 bits of data are sent to package 10-bit, 8b/10b coding efficiency of 80%, with each Byte is equal to 8 bit, so 3.0Gbps = 3000 / 8 x 80% = 300MB / s.

PATA data cable (left) and the SATA data cable (right)
in the connector, and I believe many have experienced the old home, went to great lengths, handle all the pain out of data can not be the IDE cable and 4pin power cable from the device pull down the embarrassment. The SATA data significantly reduced the volume of the plug and power plug can be easily unplugged and brought hot swappable. In length and volume data lines are also well positioned on the SATA, up to 1 meter in length and small size, so that the internal SATA cable for easy alignment of the chassis, both beautiful and can help heat inside the chassis, while the shorter and the large ratio of the IDE cable will not.
plug on the SATA interface, the number of circulating a misunderstanding: SATA Interface to plug 50. In fact, this is not correct, there are provisions in the SATA specification: the durability of the internal connector not less than 50 mating cycles, that is, to comply with the standard production of the SATA interface products, and its resistance to plugging ability is not less than 50 times, instead of up to 50 times, is the lower limit rather than limit.

ESATA (left) and SATA (right) connectors contrast
the past, we External HDD in the chassis and other equipment is generally used USB2.0 or Firewire 1394 port, but the actual transmission capacity of the two interfaces (USB 2.0 About 30MB / s; IEEE1394 about 40MB / s) far can not meet the current hard disk (more than 100MB / s) of performance requirements. The emergence of eSATA External SATA users computer equipment, and internal connections can also get the same effect. For the internal interface SATA, eSATA external interfaces only in the connector plug of the improved resistance, mating frequency can be more than 2000 times; the needle within the definition of exactly the same, and SATA interfaces.
view of this, eSATA port can be seen as an extension and expansion of SATA interface, this feature upgrades without chip conversion, there will be no loss of any conversion process will produce, so the eSATA interface and SATA interface transfer rate is completely the same, but each one is an external interface, one is the internal interface only. eSATA function of the realization function of very low cost, the biggest drawback to provide the equipment requires a separate power supply. Therefore, excellent performance and low cost has become the latest eSATA interfaces USB 3.0 technology's biggest rivals.