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