MICROPOLIS 1538 DISK DRIVE
SPECIFICATIONS
Unformatted Capacity:
Model Number
1538-15
Total Mbytes ----------------- 1043 ----------------------
Disk Platters -------------------- 8 ----------------------
Read/Write Heads ------------------- 15 ----------------------
Cylinders ----------------- 1669 ----------------------
Bytes per track ---------------- 41664 ----------------------
Formatted Capacity (typical)
Total Mbytes ------------------ 910 ----------------------
Bytes per Sector ------------------ 512 ----------------------
Sectors per Track ------------------- 71 ----------------------
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 system 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 4 msec
Average 14.5 msec
Maximum 33 msec
Average Rotational Latency 8.33 msec
Rotational Speed 3600 rpm +/- 0.5%
Data Transfer Rate 23.33 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 1669*
Reduced Write Current Start Cylinder 1669*
Landing Zone 1669*
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.
(4.3A max during start-up)
+5V +/-5% 1.5A avg.
Heat dissipation, typical 24 Watts
1538-series drives require the use of an ESDI Controller capable
of a data transfer rate of at least 23.33 Mbits/sec.
Drive Addressing and Interface Termination
NOT
USED
J12 J2 J1 J3
____ ________ ___________________ _ _________
| | | |1| | |1| | | POWER |
| |_| |____| |_| |_________|
| |
| RN11 :::::::: |
| DDDWWWWW W28: |
| AAA54321 |
| 321 |
| |
| |
| |
| (Component Side) |
| _|
| |
| |_
| |
| |
The Interface Terminator factory installed at RN11 will provide
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.
The drive address jumpers are identified as DA1,DA2 and DA3.
Address selection is binary, as shown in the table below. The ESDI
controllers'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).
Drives are factory configured as Drive Address 1.
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 only Drive Address 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 controller can typically support a maximum of two
drives.
Spindle Control Option
Jumper W5 selects the spindle control option.
When W5 is installed, the drive must wait for a start spindle
command to start the spindle motor.
When W5 is ont installed(the factory default configuration),the
drive automatically starts the spindle motor at power on.
Sectoring Options
* W1 is not used and must not be jumpered.
Frame ground Options
W28 is to select the frame ground option.
When a jumper is installed at W28, frame ground is connected to
logic ground.
When a jumper is NOT installed at W28(the factory default
configuration), frame ground is not connected to logic ground.
Sectoring Options
* 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 68 520 612
-------------------------------------------------------------
| * out out in 71 512 582 |
-------------------------------------------------------------
out in out 38 1024 1096
out in in 18 2244 2314
in out out 10 4096 4166
in out in 58 768 839
in in out 121 272 342
in in in 1 41594 41664
* This is the default (factory installed) configuration and is
recommended for PC/AT applications
