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