Maxtor FIREBALL3 Service Manual download pdf (Page 48)

Glossary

G-4 Maxtor Fireball3

H

HALF HEIGHT – Term used to describe a

drive that occupies half the vertical space of

the original full size 5 1/4-inch drive. 1.625

inches high.

HARD DISK – A type of storage medium

that retains data as magnetic patterns on a rigid

disk, usually made of an iron oxide or alloy

over a magnesium or aluminum platter.

Because hard disks spin more rapidly than

floppy disks, and the head flies closer to the

disk, hard disks can transfer data faster and

store more in the same volume.

HARD ERROR – A repeatable error in disk

data that persists when the disk is reread,

usually caused by defects in the media surface.

HEAD – The tiny electromagnetic coil and

metal pole piece used to create and read back

the magnetic patterns (write and read

information) on the media.

HIGH-CAPACITY DRIVE – By industry

conventions typically a drive of 1 gigabytes or

more.

HIGH-LEVEL FORMATTING –

Formatting performed by the operating

system’s format program. Among other

things, the formatting program creates the

root directory and file allocation tables. See

also low-level formatting.

HOME – Reference position track for

recalibration of the actuator, usually the outer

track (track 0).

HOST ADAPTER – A plug-in board that

forms the interface between a particular type

of computer system bus and the disk drive.

I

INITIALIZE – See low level formatting.

INITIATOR – A SCSI device that requests

another SCSI device to perform an operation.

A common example of this is a system

requesting data from a drive. The system is the

initiator and the drive is the target.

INTERFACE – A hardware or software

protocol, contained in the electronics of the

disk controller and disk drive, that manages

the exchange of data between the drive and

computer.

INTERLEAVE – The arrangement of

sectors on a track. A 1:1 interleave arranges

the sectors so that the next sector arrives at the

read/write heads just as the computer is ready

to access it. See also interleave factor.

INTERLEAVE FACTOR – The number

of sectors that pass beneath the read/write

heads before the next numbered sector

arrives. When the interleave factor is 3:1, a

sector is read, two pass by, and then the next

is read. It would take three revolutions of the

disk to access a full track of data. Maxtor

drives have an interleave of 1:1, so a full track

of data can be accessed within one revolution

of the disk, thus offering the highest data

throughput possible.

INTERNAL DRIVE – A drive mounted

inside one of a computer’s drive bays (or a

hard disk on a card, which is installed in one

of the computer’s slots).

J

JUMPER – A tiny box that slips over two

pins that protrude from a circuit board. When

in place, the jumper connects the pins

electrically. Some board manufacturers use

Dual In-Line Package (DIP) switches instead

of jumpers.

K

KILOBYTE (Kb) – A unit of measure

consisting of 1,024 (2

10

) bytes.

L

LANDING ZONE – A position inside the

disk’s inner cylinder in a non data area

reserved as a place to rest the heads during the

time that power is off. Using this area prevents

the heads from touching the surface in data

areas upon power down, adding to the data

integrity and reliability of the disk drive.

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