Samsung HARD DISK DRIVE Service Manual page 28

SAMSUNG HARD DISK DRIVE
Hard Disk Drive, memory device by transferring data to permanent magnetic field rather than
HDD
digital pulse. It organized HDA and PCBA.
Head Read/write data on disk directly. (MIG, Thin film, MR,GMR)
The damages of read/write and media cause a sudden contact between head and disk surface,
Head Crash
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)
Head Gimbal Ass'y, recording and replaying data and it organized slider and suspension for
HGA
supporting slider, usually we say Head..
High-Level Progressing mechanism to format program of management system. Root directory, File allocation
formatting table created.
HOLDER-FP
Parts made of plastic enable to make routing FPC.
C
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
Integrated circuit.. Electric circuit,assembly of elements of transistor,diode,resistance on the thin
IC
plate of semiconductor. CPU of PC and RAM are sort of IC.
Integrated Device Electronics. In IBM PC AT, drive type enable to connect all circuits to AT
IDE
Bus directly
Integrated Device Electronics, In IBM PC AT, drive enable to connect all circuits to AT Bus.
IDE Drive
Generally, AT drive.
Initialize Refer to low level formatting.
Disk controller to manage data between drive and computer and hard ware & software contained
Interface
within disk drive circuit. AT(IDE) and SCSI interface are usually used in small computer system.
Interleave/ Order of sector arranged within track. For example, interleave factor is 3:1 then arranged by 3
Interleave sectors for sector interval, that is, it is possible to read sector2 after reading sector1 by leaping
Factor 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 = 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,
KB/MB/GB
G=2^30=1073741824. The second one is more accurate mean on HDD capacity, but we usually
we use by the first one.
Both of them means the landing location of head when spindle motor stopping. This zone used
Landing
for protecting the risk of data damage caused from the contact between head and disk, this
Zone/Parking
zone is not stored. Recently most drives using VCM are designed head should be landed in
Zone
landing Zone automatically.
Latch Parts enable to hold ARM putting on head in constant power.
LATCH HEAD is located in parking zone on off, at this time latch screw connected in parking magnetic
SCREW and make head fixing. (latch force is determined by magnetic power )
Waiting time until target sector seek time after Read/Write Head arriving at the target track.
Latency/Rota
(Generally, 1/2 of spindle cycle ). One cycle time of disk is 16.7ms in case of spin speed is
tional
3600rpm, then average waiting time should be 8.3ms. This Latency is a one of most factor for
latency
drive efficiency, transferring speed is better getting shorter waiting time.
VANGO(VL40)
D