MICROPOLIS 1568 DISK DRIVE
SPECIFICATIONS
Unformatted Capacity:
Model Number
1518-15
Total Mbytes ----------------- 1534 ----------------------
Disk Platters -------------------- 8 ----------------------
Read/Write Heads ------------------- 15 ----------------------
Cylinders ----------------- 2104 ----------------------
Bytes per track ---------------- 48608 ----------------------
Formatted Capacity (typical)
Total Mbytes ----------------- 1341 ----------------------
Bytes per Sector ------------------ 512 ----------------------
Sectors per Track ------------------- 83 ----------------------
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 2104*
Reduced Write Current Start Cylinder 2104*
Landing Zone 2104
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
1518-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.
* W5 selects the spindle a 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 applications.
* 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 install for most
PC/AT in applications.
W28 is for 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.
* 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 82 512 594
-------------------------------------------------------------
| * out out in 83 512 584 |
-------------------------------------------------------------
out in out 44 1024 1105
out in in 22 2048 2209
in out out 11 4096 4419
in out in 58 768 839
in in out 149 256 326
in in in 1 48,608 48,608
* This is the default (factory installed) configuration and is
recommended for PC/AT applications
