what is Serial ATA?

Serial ATA (SATA) is a laptop bus interface that connects host bus adapters to mass storage devices such as hard disk drives and optical drives. Serial ATA replaces the older AT Attachment common (later referred to as Parallel ATA or PATA), supplying many positive aspects more than the older interface: lowered cable size and price (seven conductors alternatively of 40 or 80), native hot swapping, faster information transfer by means of higher signalling rates, and more efficient transfer by means of an (optional) I/O queuing protocol.

Serial ATA (SATA) is an IDE normal for connecting devices like optical drives and difficult drives to the motherboard. The term SATA usually refers to the sorts of cables and connections that comply with this normal.

SATA cables are lengthy, thin, 7-pin cables. One particular finish plugs into a port on the motherboard, usually labeled SATA, and the other into the back of a storage device like a challenging drive.

Any person who has peered into a computer is familiar with the flat, 40-wire parallel cables that connect the tough drive, CDROM and other devices to their controllers. PATA has been the regular and has served nicely, but it has also had drawbacks. Cables restricted to 18 inches (46 cm) in length typically produced connections challenging and also clogged circumstances blocking airflow, although cooling has grow to be essential. Even though rounded cables became offered, the most sophisticated PATA drives (Ultra ATA/133) hit the maximum parallel transfer price of 133 MB/ps. With the speed of CPUs, RAM and program buses enhancing, designers saw PATA would soon be bottlenecking sophisticated drive efficiency in system architecture.

SATA has several sensible positive aspects over the parallel signaling (also called Parallel ATA or PATA) that has been used in difficult drives considering that the 1980s. SATA cables are far more versatile, thinner, and much less huge than the ribbon cables needed for traditional PATA hard drives. SATA cables can be considerably longer than PATA ribbon cables, enabling the designer much more latitude in the physical layout of a system. Due to the fact there are fewer conductors (only 7 in SATA as compared with 40 in PATA), crosstalk and electromagnetic interference (EMI) are much less most likely to be troublesome. The signal voltage is a lot reduce as nicely (250 mV for SATA as compared with five V for PATA).