SATA Cables
SATA (Serial Advanced Technology Attachment / Serial ATA) is a computer bus technology primarily designed for transfer of data to and from a hard disk. It is the successor to the legacy ATA (Advanced Technology Attachment) standard also known as IDE. SATA drops the master/slave shared bus of ATA, giving each device a dedicated SATA cable and dedicated bandwidth. There are two revisions to the SATA specification: SATA 1.0a and SATA II. SATA 1.0a generally supports internal connections only and speeds of up to 1.5Mbps; SATA II supports speeds of 3Mbps and external connections known as eSATA.
Internal SATA cables connect the hard disk to the motherboard but as well as these you can fit a SATA back plate, which allows you to externally connect a hard drive, at the expense of a PCI slot. eSATA cables allow you to connect an external drive to an eSATA port on a controller card.
SCSI is faster than SATA, but requires a separate PCI card to control the hard drives and it is also much more expensive.
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