Glossary 69

connections. These connections fan out from the switch, leading directly to the

devices where the data needs to go. Every device has its own dedicated

connection, so devices no longer share bandwidth like they do on a normal bus.

PHY

The interface required to transmit and receive data packets transferred across

the serial bus. Each PHY can form one side of the physical link in a connection

with a PHY on a different Dell-qualified SATA device. The physical link

contains four wires that form two differential signal pairs. One differential pair

transmits signals, while the other differential pair receives signals. Both

differential pairs operate simultaneously and allow concurrent data transmission

in both the receive and the transmit directions.

Physical Disk

A physical disk (also known as hard disk drive) consists of one or more rigid

magnetic discs rotating about a central axle, with associated read/write heads

and electronics. A physical disk is used to store information, (data), in

a non-volatile and randomly accessible memory space.

POST

POST, short for Power-On Self-Test is a process performed before the operating

system loads when the computer is turned on. The POST tests various system

components, such as RAM, the physical disks, and the keyboard.

RAID

Acronym for Redundant Array of Independent Disks (originally Redundant

Array of Inexpensive Disks). It is an array of multiple independent physical disks

managed together to yield higher reliability and/or performance exceeding that

of a single physical disk. The virtual disk appears to the operating system as a

single storage unit. I/O is expedited because several disks can be accessed

simultaneously. Redundant RAID levels provide data protection.

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