Micropolis 1370 Series Disk Drives
SPECIFICATIONS
Drive Model Number
Unformatted Capacity: 1373 1373A 1374 1374A 1375
Total Mbytes 85.3 106.6 127.9 149.3 170.6
Disk Platters 3 3 4 4 5
Read/Write Heads 4 5 6 7 8
Cylinders ------------------ 1024 ------------------
Bytes per track ---------------- 20,832 ------------------
Formatted Capacity
Total Mbytes 72.9 91.2 109.4 127.6 145.9
Bytes per Sector ------------------- 512 ------------------
Sectors per Track -------------------- 36 ------------------
PC Drive Types
When using SCSI in a PC, the most common method is to run your
setup program and define No Drives Present. The SCSI Host Adapter
will automatically self-configure on power-up. To install the
drive, follow the manufacturer's instructions to use the on-board
BIOS routine or software that was supplied with the Host Adapter.
Performance Specifications
Seek Time (including settling time) Track-to-Track 5 msec
Average 23 msec
Maximum 50 msec
Average Rotational Latency 8.33 msec
Rotational Speed 3600 rpm +/- 0.5%
Data Transfer Rate at Interface
Asynchronous 1.6 Mbytes/sec
MTBF 30,000 hours
Positioner Fully balanced rotary voice coil
Parking Automatic park and lock
General Functional Specifications
Interface SCSI
Supports Common Comman Set
Write Precompensation Start Cylinder 1024
Reduced Write Current Start Cylinder 1024
Landing Zone 1024
Mounting Plane Any orientation
Power Requirements
+12V +/-5% 2.0A avg
(4.25A max during start-up)
+5V +/-5% 2.0A avg
Power dissipation, typical 35 Watts
Drive Addressing and Interface Termination
ID2___
ID1__ | __W3
PIN 1 ID0_ ||| _W18 or W9
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| | J1 || J2 | |
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|W1 W2 ==RN1=== ==RN7== ==RN8=== |
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ID0, ID1, ID2 SCSI Address Jumpers
The SCSI ID (drive address) jumpers are identified as ID0, ID1,
and ID2. ID selection is binary, as shown in the table below.
SCSI Jumpers
Address ID2 ID1 ID0
------- --- --- ---
0 out out out
1 out out in
2 out in out
3 out in in
4 in out out
5 in out in
6 in in out
7 in in in
For multiple drive installations, on one Host Adapter,each drive
must unique address. Drives are configured as SCSI ID 0 at the
factory.
RN1, RN7, RN8 Interface Terminators
The Interface Terminators factory installed at RN1, RN7, and RN8
provide proper termination for the interface lines. When
daisy-chaining multiple drives, leave the terminators installed
only in the last physical drive on the daisy chain cable; remove
all three terminators from each of the other drives. In most
PC/AT installations, the C: drive is actually at the end of the
cable and should retain the terminators.
W1, W2 Terminator Option
W1 and W2 select the source of terminator power (+5V) for the
interface terminators. If a jumper is installed at W1 and no
jumper is installed at W2 (the factory default configuration),
the drive provides terminator power. This configuration is used
for PC/AT applications. If no jumper is installed at W1 but a
jumper is installed at W2, terminator power is provided by the
host computer system via interface connector J1, pin 26.
W3 Spindle Option
W3 selects the spindle control option. If W3 is installed, the
drive waits for a Start Spindle command (after power is applied)
to start the spindle motor. If W3 is not installed (the factory
default configuration), the drive automatically starts the
spindle motor at power-on. W3 is not installed for PC/AT
installations.
W18 Bus Parity Option
W18 selects the parity check option. If W18 is installed, the
drive neither generates nor detects parity. If W18 is not
installed (the factory default configuration), the drive
generates parity and enables parity detection. W18 is not
installed most PC/AT applications. Refer to your host adapter's
requirements to verify if parity is to be disabled.
Note: W18 is labeled "W9" on some 137x boards.