System information

PALO
33
SAMSUNG HARD DISK DRIVE
RETAINER
RING
Component could fix bearing when inserted to ARM.
RLL
Encoding method "run length limited data" to magnetic pulse.
It can store data 50% more than MFM(Modified Frequency Modulation) method.
RMA Return Material Authorization
ROM
Searching only memory. memory would not erase during off, so we use this to program or data
need not change in PC. Mask ROM input contents when it's manufactured and PROM recorded
program by user.
Root
Directory
The place where file on disk and sub directory list.
Rotational
Latency
Time which controller find proper data with track rotating, head read/write. Generally 1/2 of full
rotation hour.
RPM Revolution per minute. RPM is higher. the data searching speed is getting higher.
SCSI
Small Computer Systems Interface. IDE drive can put only 2 drives on the same bus (4 drives
in case of Enhanced IDE), SCSI can put 8 drives on the same bus. Also it can be connected
HDD and other various device,CD-ROM, Tape drive, Printer etc. as well. 16 bit Fast SCSI can
transfer data in 20Mb speed per second. Apple Macintosh and UNIX o perating system use
mainly.
Sector Minimum classification unit which assigned by drive to store information.
Seek Moving read/write head to the particular data track.
Seek time
Time which head is located the current post move to another head written information should be
read.
Server Computer and device to produce every server to PC on PC LAN network.
Servo
ⓐ
Control system in feed-back way to move the accurate location in device,
ⓑ
Signal recorded pattered disk in every side to be capable of HEAD location controlling.
Servo Data Magnetic marking written within media enable to move read/write head to accurate location.
SERVO-WRI
TER
Servo information recording equipment on HDA assembled.
Settle time Time which head read/write the real data after arriving on proper track.
Shock
Rating
Enduring number without disk drive damage.(G unit) It is differ according to run/unrun number.,
Slave In case, several PC is connected to one PC, the rest drives except booting system(C:)
Slider
The core part of head ass'y, made for head can surface on disk, it's organized ABS, Core, Coil
in general.
SMART
Self-monitoring, Analysis and Reporting Technology. Technology of reporting the HDD inner
status and analysis to Host.
SPC Statistical Process Control.
Spindle Center shaft of drive connected hard disk platter.
Spindle
motor
Motor enable to rotate disk in continuous speed. (high speed:4500rpm,5400rpm etc)
SSA
Serial Storage Architecture. High speed and high efficiency interface technology of IBM
correspond to Seagate's FC-AL interface.
Track HDD have numerous circles in media, and these circles write data, we call this circle track.
Track
density
Track density (attachment: TPI)