Maxtor 5T010H1 Bedienungsanleitung PDF herunterladen (Seite 60)

GLOSSARY

GL – 2

CONTROLLERCONTROLLER

CONTROLLER

A miniature CPU dedicated to controlling a peripheral device, such

as a disk drive, tape drive, video display terminal, or printer. The

controller executes commands from the central processing unit and

reissues commands to the peripheral device.

CORRECTABLE ERRORCORRECTABLE ERROR

CORRECTABLE ERROR

An error that can be overcome by the use of Error Detection and

Correction.

CYLINDERCYLINDER

CYLINDER

On several disk surfaces sharing a common rotational axis, the

aggregate of tracks at a given radial position. A set of disk tracks

that are simultaneously under the set of read/write heads. This

three-dimensional storage volume can be accessed after a single

seek.

CYLINDER ZEROCYLINDER ZERO

CYLINDER ZERO

The outermost cylinder in a drive that can be used for data storage.

DATADATA

DATA

An ordered collection of information. In a specific case, it is the

information processed by a computer.

DATA SEPARATORDATA SEPARATOR

DATA SEPARATOR

An electronic circuit which decodes playback data and produces

separate clock and data bits. Sometimes incorrectly used to denote

data synchronizer.

DATA SYNCHRONIZERDATA SYNCHRONIZER

DATA SYNCHRONIZER

An electronic circuit producing a clock signal that is synchronous

with the incoming data stream. This clock signal is then used to

decode the recording code being used into user data.

DATA TRANSFER RATEDATA TRANSFER RATE

DATA TRANSFER RATE

In a disk or tape drive, the rate at which data is transferred to or

from the storage media. It is usually given in thousands of bits per

second (Kbit/second) or millions of bits per second (Mbit/second).

DEDICATED LANDING ZONEDEDICATED LANDING ZONE

DEDICATED LANDING ZONE

A designated radial zone on the disk where contact starting and

stopping occur by design.

DEDICATED SERVODEDICATED SERVO

DEDICATED SERVO

A servo scheme in which a prerecorded pattern on an otherwise

unused disk surface provides position information to the servo

circuitry by means of a head reading that surface.

DEFECTDEFECT

DEFECT

A magnetic imperfection in a recording surface.

DEFECT MANAGEMENTDEFECT MANAGEMENT

DEFECT MANAGEMENT

A general methodology of avoiding data errors on a recording

surface by avoiding the use of known bad areas of media. Usually

defective sectors or tracks are retired and data are written in

alternate locations. Several algorithms are possible such as “sector

slipping,” or “spare sector per track.”

DEFECT MAPDEFECT MAP

DEFECT MAP

A list of defects that fall within a pass/fail criteria of a user. This list

is usually used by an operating system or a disk drive controller for

defect management.

DEFECT SKIPPINGDEFECT SKIPPING

DEFECT SKIPPING

A defect management scheme for avoiding surface defects. It has

data written before and after the defect, instead of using alternate

tracks or sectors to avoid use of the defective area.

DENSITYDENSITY

DENSITY

Generally, recording density. See areal, bit, and storage density.

DC ERASEDC ERASE

DC ERASE

The method of erasing a track using a DC write/erase current

through either a Read/Write or Erase head.

DIGITALDIGITAL

DIGITAL

Any system that processes digital binary signals (having only values

of a 1 or 0; usually in bits and bytes) rather than analog signals

(signals that can have many values)

DIGITAL MAGNETIC RECORDINGDIGITAL MAGNETIC RECORDING

DIGITAL MAGNETIC RECORDING

See magnetic recording.

DIRECT ACCESSDIRECT ACCESS

DIRECT ACCESS

Access directly to memory location. (See random access).

DIRECT MEMORY ACCESSDIRECT MEMORY ACCESS

DIRECT MEMORY ACCESS

A mean of data transfer between the device and host memory

without processor intervention.

DIRECTORYDIRECTORY

DIRECTORY

A listing of files maintained by the disk operation system (DOS) or a

data base management system to enable a user to quickly access

data files.

DISKDISK

DISK

A flat, circular piece of metal (usually aluminum) or plastic (usually

mylar) with a magnetic coating upon which information can be

recorded. (See, for example, floppy disk or Winchester disk)

DISK DRIVE OR DISK MEMORY DEVICEDISK DRIVE OR DISK MEMORY DEVICE

DISK DRIVE OR DISK MEMORY DEVICE

The total electromechanical storage device containing disks and

read/write heads, head positioning mechanism, drive motor, and

electronics.

DISK PACKDISK PACK

DISK PACK

A number of metal disks packaged in a canister for removal from the

disk drive (predecessor of Winchester technology).

DISK OPERATING SYSTEM (DOS)DISK OPERATING SYSTEM (DOS)

DISK OPERATING SYSTEM (DOS)

The master computer system program that schedules tasks,

allocates the computer system resources, controls accesses to

mass storage devices, manages files, and so forth. Typical disk

operating systems include CP/M, MS-DOS, and UNIX.

DISK STORAGEDISK STORAGE

DISK STORAGE

Auxiliary memory system containing disk drives.

DISK TRANSFER RATEDISK TRANSFER RATE

DISK TRANSFER RATE

The rate that digital data is transferred from one point to another.

Expressed in either bits/second or bytes/second.

DOUBLE FREQUENCY ENCODINGDOUBLE FREQUENCY ENCODING

DOUBLE FREQUENCY ENCODING

Another name for FM encoding. This is because all possible data

combinations will result in only two possible temporal displacements

of adjacent data bits, specifically “1F” and 2F.”

EARLY WINDOWEARLY WINDOW

EARLY WINDOW

A data window that has been intentionally shifted in time in an early

direction.

EMBEDDED SERVOEMBEDDED SERVO

EMBEDDED SERVO

A servo technique used for track following. Position information is

prerecorded between data areas in a track so that a data head, and

proper additional circuitry, can determine the data head location

with respect to the center position of the track (or cylinder) in

question.

ERASEERASE

ERASE

A process by which a signal recorded on a medium is removed and

the medium made ready for rerecording.

ERROR CORRECTION CODE (ECC)ERROR CORRECTION CODE (ECC)

ERROR CORRECTION CODE (ECC)

A mathematical algorithm that can detect and correct errors in a

data field. This is accomplished with the aid of Check Bits added to

the raw data.

ERROR FREEERROR FREE

ERROR FREE

A recording surface that has no defects.

ERROR RATEERROR RATE

ERROR RATE

The number of errors (type must be specified) that occur in a

specified number of bits read.

ERROR RECOVERY PROCEDUREERROR RECOVERY PROCEDURE

ERROR RECOVERY PROCEDURE

The process that occurs in response to a data error. In a drive

without ECC, this would include re-calibration and re-seeking to the

specified track and rereading the specified data.

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