|Access Time:||The time it takes for a disk drives head to reach a sector after the|
issuance of a read or write command. Command overhead + seek
time + latency = access time.
|Address: (SCSI)||The ID number of a target or host on the SCSI Bus. Must be|
between 0 – 7, and no two devices can have the same ID number.
|Average Seek Time:||The milliseconds of time that it takes to do all possible seeks on a|
drive divided by the number of seeks possible.
|Bit:||The binary digit representation of 0 and 1. This is the basic|
language of computers, states of either ons or offs.
|Block:||Usually 512 bytes of information and a common unit that is|
transferred at one time to and from a hard drive or to and from
|Byte:||A group of eight bits. This is the standard size unit for computer|
|CD-ROM:||A storage device that is commonly used on computer Systems.|
Holds up to 650 Megabytes of information. You can not write to
a CD-ROM, only read from it.
|CPU:||Central Processing Unit: The heart of the computer. Usually one|
large integrated circuit.
|Data-Transfer Rate:||How fast a drive or other device can transfer bytes of information.|
|Device Driver:||A piece of software that controls the operation of any attached|
|Firmware:||Software instructions that are stored in ROM directly on the drive|
or SCSI device. Fragmentation: With use over time, the sectors
of a file are written in different areas across the platters surface.
This slows access time.
|KB/s:||Kilobytes per second, or 1,000 bytes per second.|
|Kb/s:||Kilobits per second, or 1,000 bits per second.|
|MB/s:||Megabytes per second, or 1,000,000 bytes per second.|
|Mb/s:||Megabits per second, or 1,000,000 bits per second|
|Partition:||A defined part of a drive that is allocated to a specific user or|
|Peripheral:||A device (target) that is attached to the SCSI bus. It can also be|
any device attached to a computer system.
|Platter:||The disk that rotates inside of a drive and where the data is stored.|
|SCSI:||Small Computer System Interface. A bus structure in which|
peripherals can be easily and quickly attached to a host computer.
|Sector:||An allocated amount of space on a platter. Usually 512 bytes|
|Tracks:||Invisible magnetic “grooves,” in the form of concentric circles that|
store data on a platter.