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Micropolis 1355 ESDI
Micropolis 1350 Series Disk Drives
SPECIFICATIONS
Model Number
Unformatted Capacity 1353 1353A 1354 1354A 1355
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 75.4 94.2 113.1 131.9 150.8
Bytes per Sector ------------------- 512 -----------------
Sectors per Track -------------------- 36 -----------------
PC Drive Types
If you are using third-party installation software or an on-board
BIOS on the controller, follow the instructions included with the
software or controller. Otherwise, examine the entries in your
drive table and find the type that most resembles the head and
cylinder parameters of the drive without exceeding these
parameters.
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 10 Mbits/sec
MTBF 150,000 hours
Positioner Fully balanced rotary voice coil
Parking Automatic park and lock
General Functional Specifications
Interface ESDI
Sectoring (see W1 description below) Hard or Soft
Write Precompensation Start Cylinder 1024*
Reduced Write Current Start Cylinder 1024*
Landing Zone 1024
Mounting Plane Any orientation
* These are effectively turned off by specifying a non-existent
cylinder. Some systems accomplish this by using a value of "-1"
Power Requirements
+12V +/-5% 2.0A avg
(4.25A max during start-up)
+5V +/-5% 2.0A avg
Power dissipation, typical 32 Watts
Drive Addressing and Interface Termination
NOT
J1 J2 USED
___ __________________ ____________ ___ ___
| | |1| | |1| | | | | |
| |_| |___| |_| |_| |
| D D D |
| TERMINATOR A A A W W W W W |
| 3 2 1 5 4 3 2 1 |
| |
| |
| (COMPONENT SIDE) |
RN1 Interface Terminator
The Interface Terminator factory installed at RN1 provides proper
termination for the interface lines. When daisy-chaining multiple
drives, leave the terminator installed only in the last physical
drive on the daisy chain cable; remove the terminator 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
terminator.
DA1, DA2, DA3 Drive Select Jumpers
The Drive Address jumpers are identified as DA1, DA2, and DA3.
Address selection is binary, as shown in the table below. The
ESDI controller's documentation will specify the drive address
to use.
Drive Select Jumpers
Address DA3 DA2 DA1
------- --- --- ---
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
"Drive Address 0" (no jumper at DA1, DA2 or DA3) is a "deselect"
(i.e., no drive selected). For many multiple drive installations,
each drive must have a unique address. An exception is that for
every drive in a PC/AT installation, verify that the only Drive
Address jumper is at DA2; move the jumper if necessary (the
special twisted interface cable that is generally used takes care
of assigning a unique address to each drive). PC/AT controllers
can typically support a maximum of two drives.
W5 Select the Spindle Control Option
W5 selects the spindle control option. If W5 is installed, the
drive waits for a Start Spindle command (after power is applied)
to start the spindle motor. If W5 is not installed (the factory
default configuration), the drive automatically starts the
spindle motor at power-on. W5 is not installed for PC/AT
installations.
W1 Selects the Sectoring Mode.
If W1 is installed, the drive operates in the soft-sectored mode.
If W1 is not installed (the factory default configuration), the
drive operates in the hard-sector mode. W1 is not installed for
most PC/AT applications.
W2, W3, W4 Sector Size Option
The number of bytes per sector may be specified using the Set
Bytes Per Sector command or by selecting a default sector
configuration with jumpers W2, W3, and W4 as follows:
Jumpers Sectors Bytes/Sector
W4 W3 W2 Per Track Formatted Unformatted
--- --- --- --------- --------- -----------
out out out 35 512 595
-------------------------------------------------------------
| * out out in 36 512 578 |
-------------------------------------------------------------
out in out 19 1024 1096
out in in 9 2048 2314
in out out 5 4096 4166
in out in 32 512 651
in in out 64 256 325
in in in 1 20,832 20,832
* This is the default (factory installed) configuration and is
recommended for PC/AT applications
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