Samsung SP0211N Service Manual page 26

SAMSUNG HARD DISK DRIVE
2. Explanation of HDD terms
Attachment
Access Read, write, or update inforamtion on some storage medium such as a disk.
The interval between the time a request for data is made by the system and the time the data
Access time is available from the drive.Access time includes the actual seek time, rotational latency and
command processing overhead time.
Actuator The internal mechanism that moves the read/write head to the proper track
Allocation The process of assigning particular areas of the disk to particular data or instructions.
Allocation An Allocation unit is a group of sectors on the disk that can be reserved for the use of a
Unit particular file.(usually in the form of sector, block or cluster)
Buffer An area of RAM reserved for temporary storage of data that is waiting to be sent to a device.
Air Bearing Surface. Establish flat surface slantingly at the both sides of head to make head
ABS
rise on disk by using air pressure.
Access Reading, writing, updating information stored in disk.
Time from requesting data to assuring data on disk in system.
Access time
(contained seek time, rotational latency, command processing overhead time)
Actuator Mechanism of making read/write head move to the proper track.
AFR Annualized Failure Rate. Accumulated failure rate.
Allocation Process of storing Data instruction at the particular region in disk.
Allocation Remaining sector set on disk to be used for specific file.
Unit (commonly, in form of sector, block, cluster )
APM Advanced Power Management Hardware.
Areal
Recording capacity per 1 square inch. Areal Density = BPI × TPI [Mb/Inch]
Density
Assembled HGA(Head Gimbal Assembly) and VCM at the back and forth of ARM. Parts which
Arm is connected to pivot bearing of base. (Parts enable to move head to proper location on Base
physically)
AT Advanced Technology interface or IDE. Interface to be designed for IBM transfer PC.
AT Attachment Device. Device is equivalent to ANSI ATA spec. HDD, contained tape drive,
ATADevice
CD-ROM.
Improved the existing AT interface, Interface is correspond to E-IDE of W/D by suggestion of
ATA-2
Seagate
Audit Examine the factory.
Average
The average time it takes for the read/write head to move to a specific location.
Seek Time
protect information recorded in media from damage by breaking the remained current flowed to
Back Gap
head in magnetic body.
A block (usually the size of a sector) that cannot reliably hold data because of meadia flaw or
Bad Block
damaged format markings.
Lead plate to maintain the balance of ARM. (The amount of disk and head are different in case
BALANCING
of different capacity of the same series, so this maintain the center of gravity because the
PLATE
center of gravity of ARM is changing according to those of head changing. )
Basic frame for parts assembling of HDD. spindle motor, arm, VCM, cover, PCB are assembled
Base
on Base.
PALO
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