Samsung SP0211N Service Manual page 32

SAMSUNG HARD DISK DRIVE
Time to perform the real order for controller, host adaptor and drive. The faster overhead is,
Overhead
the faster performing time.
Overwrite Recorded data erased by overlapping the existing data.
Parking
= Landing Zone
Zone
When we use one HDD for multi ones dividing section logically, every memory section is
Partition
partition, For example, 2.5GB HDD can be used for one 2.1GB computer and one 400MB.
Printed Circuit Board Assembly. Kind of IC and Chips are Soldered on board and make run
PCBA
HDA, PCBA is a half-finished goods.
PCMCIA Personal Computer Memory Card International Association.
Pentium 586 Microprocessor to apply IBM type developed by Intel
Pentium
Pentium's next CPU. 5.5 billion transistor integrated. There are 150, 166, 180, 200MHz.
Pro(P6,686)
Peripheral Additional device except basic CPU. There are Disk Drive, Tape Drive, CD-ROM.
PIO Programmed Input/Output.
Pivot
Roll bearing is fixed on the rotating center of ARM.
Bearing
Plated Disk is covered with hard metal alloy rather than disk Iron-oxide compound.
Media The more data could be stored.
Platter Metal disk record data within HDD
POH Power On Hour, used for MTBF.
Power PC RISC type CPU is developed by IBM, Apple and Motorola commonly.
PQT Pre-qualification test
Partial Response Maximum Likelihood, this is a read/write method to improve recordi density and
PRML data transferring rate. This method enable to improve capacity as 30% more than the existing
data transferring by using Peak Detection.
PVT Production verification test
QMS Quality management system. Overall quality management system
Redundant Arrays of Independent Disks. To protect a sudden data damage, connect HDD in
RAID parallel and diverge data , that is high speed back-up device enable to improve data
preservation and low speed access for tape the problem of the current back-up device.
Random access Memory. Semiconductor memory enable to input and search,we have DRAM
RAM
and SRAM.
Look-ahead method is not only reading data requested from host but also reading- ahead
continuous data to buffer sequentially, We improve data transferring speed because we don't
Read cache
need to read again in time host request information pre-read by applying for file's sequential
saving method.
Read Order of reading all data from HDD, read sector occur interrupt per every sector transferring,
Sector/Read read multiple occur interrupt per designated sector number by set multiple order. Also read DMA
multiple/Rea occur interrupt only one time after transferring data from host request. For example, 4 is chosen
d DMA by set multiple and host need 10 sectors then the below picture draw how to occur Interrupt.
Recoverable
Err/Uncovera Similar to Soft Hard err. Recoverable err means it is possible to read normally though data was
ble read wrong, unrecoverable err means it is impossible to recover error by any means.
Err/Correcta Correctable err is belong to Recoverable err, this is recovered by software ECC.
ble Err
PALO
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