Access time is defined as the time from the leading edge of the last
Step pulse received to SEEK COMPLETE (including carriage settling).
The period between Step pulses must be between s,.sec and 2O!psec.
Average access time is measured over a lOS·track seek (one·third
stroke.' The calculation assumes the following:
I. Nominaltempc:rature and power
2. The average is taken from an inward one-third stroke, plus an out·
ward one-third stroke.
Track-to- Track:
Avcrage:
Maximum Seek:
ACCESS TIME DEFINITION AND TIMING
PERFORMANCE SPECIFICATIONS
lO.Omsec max.
65.Omsec max. '
150.Omsec
mIX. '
11.11
U.1
fOrMliit<Ki
1(1.15MB 28.42 MB
5.tM MB S.JS MR
U92 Bytes g,704 Bytes
156 Bytes 512 Bytes
31 Sectors 11 Secton
Varona'lIed
25.&1 MB
6.41 M8
10,416 Bytes
NA
NA
Capadty
Per Drive:
Pcr Surrace:
Per Track:
Per Sector:
Sectors per Track:
1QO
SPECIFICATION
SUMMARY
'1
The primary functions. listed below, are incorporated within the cus-
tom spindle motor IC (lC 48).
I. Monitors the Hall signal from the spindle motor and uses the Hall
transistions to commutate the motor phases. It regulates the motor
speed by measuring the Hall period and comparing it to the oscilla·
tor clock period.
1. Employs a sense line to regulate the start current and execute a cur·
rent limit shut-orr.
3. Monitors the power supply for output driver shut-olf •. When the
power is olf. the oulput drivers become self-biases on, which brakes
the molor using back·EMF. '
4. Locked·Rolor Protection: IC 48 monitors the .ime from the first
Hall transition. If the mOlor does not spin.up. the drivers will be
disabled to avoid overheating Ihe circuil. This Hall signal is gen·
crated by a transducer located in the motor hub. Two complele
square waves are generated each comple.le revolution.
FUNCTIONAL SPECIFICATIONS
1.2
Rotational Speed:
Latency:
Recording Density:
Aux Density:
Track Density:
Cylinders:
Tracks:
ReadfWrite Heads:
Discs:
DaUlTransfer Rate:
Recording Scheme:
3,600 RPM
± 1'1(,
8.33msec nominal
9,827 BPI (Cylinder 614)
9,827
Fa(Cylinder 614)
588 TPI
615
2,460
4
2
5.0 Megabits/second
MFM
(!J
PHYSICAL SPECIFICATIONS
~.3
Height:
Width:
Depth:
Weight:
I.6J Inche$ mo:. (41.4mm)
5.75 •.: iodle$
U~.OS '.:' mm)
8.00 inehei mo. {W3.2mm)
2.13 Ibs (USKII)
I. hft'•••••-Sft.
J1
ST11' OEM/Bn. F
ST11' OEM/An. F
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