                   MICROPOLIS 1518 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 
