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- MICROPOLIS 1558 DISK DRIVE
- SPECIFICATIONS
-
- Model Number
- Unformatted Capacity: 1558-15
-
- Total Mbytes ---------------- 382.3 --------------------
- Disk Platters -------------------- 8 --------------------
- Read/Write Heads ------------------- 15 --------------------
- Cylinders ----------------- 1224 --------------------
- Bytes per track --------------- 20,832 --------------------
-
- Formatted Capacity (typical)
-
- Total Mbytes ---------------- 338.1 --------------------
- 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 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 18 msec
- Maximum 40 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 1224*
- Reduced Write Current Start Cylinder 1224*
- Landing Zone 1224
- 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
- USED J2 J1 J3
- ____ ________ ___________________ _ _________
- | | | |1| | |1| | | POWER |
- | |_| |____| |_| |_________|
- | |
- | R |
- | N |
- | 1 |
- | |
- | W1 |
- | W2 |
- | W3 |
- | (Component Side) W4 |
- | W5 _|
- | DA1 |
- | DA2 |_
- | DA3 |
- | |
-
- RN1 Interface Terminator
- The Interface Terminator factory installed at RN1 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; 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 Address 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). 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 the 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 controllers can typically support
- a maximum of two drives.
-
- 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 will
- automatically start 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 installed for
- most PC/AT in 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