PALO
30
SAMSUNG HARD DISK DRIVE
HDD
Hard Disk Drive, memory device by transferring data to permanent magnetic field rather than
digital pulse. It organized HDA and PCBA.
Head
Read/write data on disk directly. (MIG, Thin film, MR,GMR)
Head Crash
The damages of read/write and media cause a sudden contact between head and disk surface,
they are also occurred because of dust,particles or other contamination within HDA.
Head Stack
Status ARM and HGA assembled.
Height
Vertical height of HDD ( 1 inch height is used generally in case of 3.5" drive)
HGA
Head Gimbal Ass'y, recording and replaying data and it organized slider and suspension for
supporting slider, usually we say Head..
High-Level
formatting
Progressing mechanism to format program of management system. Root directory, File allocation
table created.
HOLDER-FP
C
Parts made of plastic enable to make routing FPC.
HSA
HEAD STACK ASS'Y,. Assembled HGA with FPC ASS'Y in ARM.
Hz
Herz. The number of event during 1 second.
I/O
Data Input/output
IC
Integrated circuit.. Electric circuit,assembly of elements of transistor,diode,resistance on the thin
plate of semiconductor. CPU of PC and RAM are sort of IC.
IDE
Integrated Device Electronics.
In IBM PC AT, drive type enable to connect all circuits to AT
Bus directly
IDE Drive
Integrated Device Electronics, In IBM PC AT, drive enable to connect all circuits to AT Bus.
Generally, AT drive.
Initialize
Refer to low level formatting.
Interface
Disk controller to manage data between drive and computer and hard ware & software contained
within disk drive circuit. AT(IDE) and SCSI interface are usually used in small computer system.
Interleave/
Interleave
Factor
Order of sector arranged within track. For example, interleave factor is 3:1 then arranged by 3
sectors for sector interval, that is, it is possible to read sector2 after reading sector1 by leaping
over 2sector. We need 3 rotations to read all data of track. Now days, Most interleave is 1:1.
IQC
Incoming quality control.
Inspection process for import.
Jumper
Device in type of hardware, it decide HDD connecting status (Master/Slave etc.)
Jumper Pin
A small parts enable to choose drive running mode.(Master/Slave)
KB/MB/GB
KB = Kilo Byte, MB = Mega Byte, GB = Giga Byte. K,M,G have double meanings. First,
K=1000, M=1000000, G=1000000000, second K=2^10=1024, M=2^20=1048576,
G=2^30=1073741824. The second one is more accurate mean on HDD capacity, but we usually
we use by the first one.
Landing
Zone/Parking
Zone
Both of them means the landing location of head when spindle motor stopping. This zone used
for protecting the risk of data damage caused from the contact between head and disk, this
zone is not stored. Recently most drives using VCM are designed head should be landed in
landing Zone automatically.
Latch
Parts enable to hold ARM putting on head in constant power.
LATCH
SCREW
HEAD is located in parking zone on off, at this time latch screw connected in parking magnetic
and make head fixing. (latch force is determined by magnetic power )
Latency/Rota
tional
latency
Waiting time until target sector seek time after Read/Write Head arriving at the target track.
(Generally, 1/2 of spindle cycle ). One cycle time of disk is 16.7ms in case of spin speed is
3600rpm, then average waiting time should be 8.3ms. This Latency is a one of most factor for
drive efficiency, transferring speed is better getting shorter waiting time.
