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SCSI Interface Hard Disk Drives Stock Nos SCSI Interface Hard Disk Drives Stock Nos. 192-0472 and 192-0488 Installation Orientation Figure 1. The drive may be installed in one of three orientations; either PCB down or on either edge. Inclination from vertical or horizontal should not exceed 5¡. Mounting screw fixing Figure 2. When the mounting screw holes on the side of the drive are used, then use only the two pairs of outer holes. Do not use the centre holes in conjunction with only one of the outer holes. The screw must not penetrate the drive by more than 4 millimetres. Grounding Sufficient grounding will be provided for correct operation when the drive is screwed into an electrically grounded frame. Cooling Figure 3. Allow space above and below the drive to provide for adequate air flow. Fan cooling is recommended. The disk enclosure temperature, measured at top centre, should A never exceed 60¡C. Termination A. Temperature measurement point A terminating resistor should be installed at both ends of the SCSI bus. When shipped from the factory, this drive is terminated. If the drive is to be used in the middle of the SCSI cable with other terminated devices at the ends, or if external termination is to be used, then the terminating resistor pack on the drive must be removed. Signal Pin Pin Signal GROUND 1 2 -DB0 GROUND 3 4 -DB1 GROUND 5 6 -DB2 GROUND 7 8 -DB3 GROUND 9 10 -DB4 GROUND 11 12 -DB5 GROUND 13 14 -DB6 GROUND 15 16 -DB7 GROUND 17 18 -DBP GROUND 19 20 GROUND GROUND 21 22 GROUND Reserved 23 24 Reserved Open 25 26 TERMPWR Reserved 27 28 Reserved GROUND 29 30 GROUND GROUND 31 32 -ATN GROUND 33 34 GROUND GROUND 35 36 -BSY GROUND 37 38 -ACK GROUND 39 40 -RST GROUND 41 42 -MSG GROUND 43 44 -SEL GROUND 45 46 -C/D GROUND 47 48 -REQ GROUND 49 50 -I/O Functional specifications Environmental specifications Functional specifications Form factor : 3.5 inch x 1 inch high Interface : SCSI-2, fast, single-ended maximum cable length = 6 metres Total storage capacity : 192-0472 192-0488 Formatted : 545.00MB 1,092.00MB Storage capacity/track Formatted : 35,840 to 64,000 bytes Number of disks : 2 3 Number of heads : 3 6 Number of cylinders : 3,457 +1 CE +15 SA Recording density : 72,700 bpi Track density : 3,676 tpi Recording method : RLL 1/7 Data transfer rate : Disk drive : 7.84 Mb/sec maximum Interface : 10.0 Mb/sec maximum Rotational speed : 5,400 RPM Average latency time : 5.56 milliseconds Termination power TERMPWR must be supplied to the terminating resistor for correct operation. This can be supplied from either the drive or the SCSI bus. If external termination is to be used then TERMPWR should be supplied to the SCSI bus. (i.e. Pin 26 of the interface). Switch settings PCB layout All configurations marked* are default settings. Terminal CNH1 Pins Status Function 1-2 OPEN* SCSI ID bit value 1 3-4 OPEN* SCSI ID bit value 2 5-6 OPEN* SCSI ID bit value 4 7-8 OPEN Spin up via command SHORT* Spin up on power up Notes: 1-6 Always ensure that each device on the SCSI bus has been assigned a unique ID. 7-8 Remove this jumper only if the host adapter supports START/STOP UNIT command. Connector CN6 Pin Function A0 SCSI ID bit value 1 A1 SCSI ID bit value 2 A2 SCSI ID bit value 4 7-8 Reserved 9-10 Reserved Connector CN5 Pin Function 01 LED(V) 02 LED Cable length should not exceed 30 centimetres SCSI connector (CN1) pin assignment Figure 4. 1 49 50 A B A. 5V d.c. C. 12V Return D C B. 12V d.c. D. 5V Return Positioning time : minimum : 3 milliseconds average : Read 10ms, write 12ms maximum : 25 milliseconds Power consumption : 6.4 Watts Outer dimensions : Width x height x depth : 101.6mm x 25.4mm x 146.0mm Data buffer : 512 KB FIFO ring buffer, 16 segments with read ahead cache Weight : 0.6kg MTBF : 250,000 power-on hours Motor start/stop time : start : 10 seconds typical stop : 20 seconds or less Environmental specifications Operating Temperature : 5¡C to 50¡C Temperature gradient : 15¡C per hour or less Relative humidity : 20% to 80% RH non-condensing Altitude range : -300 to 3,000 metres Vibration : Less than 0.5G (5Hz to 250Hz) Except resonance frequency = 435Hz Shock : Less than 5G (max. 11ms) Acoustic noise : 43 dBA at 1 metre Non-operating Temperature : -45¡C to 60¡C Temperature gradient : 15¡C per hour or less Relative humidity : 5% to 95% RH non-condensing Maximum wet bulb temp : 29¡C Altitude range : -300 to 12,000 metres Vibration : Less than 4.0G (5Hz to 500Hz) (power off state after installation) Shock : Less than 50G (max. 11ms) (during transportation and storage) RS Components Issued November 1995 10060.
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