Micropolis 1370 Series Disk Drives SPECIFICATIONS Drive Model Number Unformatted Capacity: 1373 1373A 1374 1374A 1375 Total Mbytes 85.3 106.6 127.9 149.3 170.6 Disk Platters 3 3 4 4 5 Read/Write Heads 4 5 6 7 8 Cylinders ------------------ 1024 ------------------ Bytes per track ---------------- 20,832 ------------------ Formatted Capacity Total Mbytes 72.9 91.2 109.4 127.6 145.9 Bytes per Sector ------------------- 512 ------------------ Sectors per Track -------------------- 36 ------------------ PC Drive Types When using SCSI in a PC, the most common method is to run your setup program and define No Drives Present. The SCSI Host Adapter will automatically self-configure on power-up. To install the drive, follow the manufacturer's instructions to use the on-board BIOS routine or software that was supplied with the Host Adapter. Performance Specifications Seek Time (including settling time) Track-to-Track 5 msec Average 23 msec Maximum 50 msec Average Rotational Latency 8.33 msec Rotational Speed 3600 rpm +/- 0.5% Data Transfer Rate at Interface Asynchronous 1.6 Mbytes/sec MTBF 30,000 hours Positioner Fully balanced rotary voice coil Parking Automatic park and lock General Functional Specifications Interface SCSI Supports Common Comman Set Write Precompensation Start Cylinder 1024 Reduced Write Current Start Cylinder 1024 Landing Zone 1024 Mounting Plane Any orientation Power Requirements +12V +/-5% 2.0A avg (4.25A max during start-up) +5V +/-5% 2.0A avg Power dissipation, typical 35 Watts Drive Addressing and Interface Termination ID2___ ID1__ | __W3 PIN 1 ID0_ ||| _W18 or W9 | ||||| ____________________________________________________________ | | J1 || J2 | | | |________________________________||______________| | |W1 W2 ==RN1=== ==RN7== ==RN8=== | | | | | | | | | | | | | | | | (Component Side) | | | | | | | ID0, ID1, ID2 SCSI Address Jumpers The SCSI ID (drive address) jumpers are identified as ID0, ID1, and ID2. ID selection is binary, as shown in the table below. SCSI Jumpers Address ID2 ID1 ID0 ------- --- --- --- 0 out out out 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 For multiple drive installations, on one Host Adapter,each drive must unique address. Drives are configured as SCSI ID 0 at the factory. RN1, RN7, RN8 Interface Terminators The Interface Terminators factory installed at RN1, RN7, and RN8 provide proper termination for the interface lines. When daisy-chaining multiple drives, leave the terminators installed only in the last physical drive on the daisy chain cable; remove all three terminators 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 terminators. W1, W2 Terminator Option W1 and W2 select the source of terminator power (+5V) for the interface terminators. If a jumper is installed at W1 and no jumper is installed at W2 (the factory default configuration), the drive provides terminator power. This configuration is used for PC/AT applications. If no jumper is installed at W1 but a jumper is installed at W2, terminator power is provided by the host computer system via interface connector J1, pin 26. W3 Spindle Option W3 selects the spindle control option. If W3 is installed, the drive waits for a Start Spindle command (after power is applied) to start the spindle motor. If W3 is not installed (the factory default configuration), the drive automatically starts the spindle motor at power-on. W3 is not installed for PC/AT installations. W18 Bus Parity Option W18 selects the parity check option. If W18 is installed, the drive neither generates nor detects parity. If W18 is not installed (the factory default configuration), the drive generates parity and enables parity detection. W18 is not installed most PC/AT applications. Refer to your host adapter's requirements to verify if parity is to be disabled. Note: W18 is labeled "W9" on some 137x boards.