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array
Two or more disk drives working in tandem as a single device. Sometimes used as a
synonym for RAID (see below).
BIOS
Abbreviation for Basic Input/Output System. The BIOS is the device that manages the
devices that are installed in the computer and can be used to control the computer’s
configuration, including startup options and any integrated peripherals.
logical drive
When a RAID is created, it collects information about the drives actually connected to the
controller and reports them as a single drive to the computer: the result of this process is
the logical drive. The size of the logical drive compared to the total capacity of the disks
actually installed (the “physical” drives) may vary considerably based on the RAID level
implemented for the solution. Note that this is not the same as a “logical drive” in the
sense of an operating system (software-based) partitioning of a hard drive, since this
translation is handled on a hardware level and is transparent to the end user. Since a
RAID appears to the computer and the operating system as a single drive, it can be
formatted and partitioned as though it were a single disk.
metadata
Literally interpreted to mean “data about data.” Since RAID configurations present the
hard disks contained within them (array) to the computer as a single drive, the records of
how the array is bound together between the drives (where the data is stored, the order
of the drives in the array, and the information needed to rebuild a failed drive) are all
considered metadata.
mirroring; mirrored set [of disks]
A process where one drive automatically keeps an exact copy of another disk (RAID 1).
physical drive
A drive that is physically installed in the computer and connected to the RAID controller.
RAID
Abbreviation for Redundant Array of Inexpensive Disks. This technology allows users to
pool their hard drives in order to improve speed, fault tolerance, or both. RAID is
available in several different versions, commonly referred to as “levels.” The phrase“level”
suggests that there is a hierarchy between levels, which is not strictly the case. The many
implementations of RAID each have their own advantages, disadvantages, and technical
requirements. RAID can be implemented through software or hardware. Hardware
solutions are generally preferred for a higher degree of performance and reliability.
Serial Advanced Technology Attachment (Serial ATA or SATA)
Serial ATA is a relatively new method of connecting hard drives and other devices to a
Instruction Manual
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