SCSI RS Stock No. 213-7384 and 213-7407

Installation Orientation

Figure 1.

The drive may be installed in one of five orientations; 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 User must ensure that the casing is NEVER shorted to the systemÕs Frame or DC Ground. Magneto-Resistive Read heads are a significant factor in the achievement of very high capacities in small form factor hard disk drives. Hard Disk Drives with Magneto-Resistive (MR) heads require special handling considerations. The MR head must be electrically biased in order to function, and the drives use +5.5V d.c. The voltage is generated by the drive electronics from the normal +5.5V d.c. and +12V d.c. rails, so standard power supplies and connectors may be used. With the MR head biased in this way, it becomes important to avoid the possibility of discharge between the head and the media, so, in order to ensure operational reliability, the disk enclosure (DE) and hence the platters themselves are also biased to +5.5V d.c. resulting in zero potential difference between head and platter. This means the outer casing of the DE is set at +5.5V d.c. rather than DC ground as would be the case on a conventional drive. The drive features protection against accidental shortening by coating the DE with an electrically insulating material and by removing the earthing tag that would normally be present. Also the drive is protected against damage in the event of accidental shorting through the use of a protection circuit in the head IC. This works by quickly shutting off the bias voltage when it detects a volatge drop. Any read or write operation during this time will result in a hard data error. When the short is removed the bias voltage is automatically restored and read/write operations will again work normally. Pay close attention to the mounting specifications of the drive ensuring that no component of the system is likely to abrade the disk enclosure surface. Cooling Allow space above and below the drive to provide for Figure 3. adequate air flow. Fan cooling is recommended. The disk enclosure temperature, measured at top centre, A should never exceed 50¡C.

A. Temperature measurement point Switch settings All configurations marked * are default setting Terminal CN7 PIN# Signal name PIN# Single name Plug Notes 01 GND 02 *S-ID 0 Yes - 03 GND 04 *S-ID 1 Yes - 05 GND 06 *S-ID 2 Yes - 07 GND 08 *SYCIN - Sync pulse 09 N.C. 10 *PCMP - DR-RST when 0V 11 GND 12 *WTP Yes For WT protect 13 GND 14 DISCON Yes For termination 15 LED-V5 16 *LEDSG - For outer LED

SCSI ID Setting CN7 PIN 01-02 PIN 03-04 PIN 05-06 SCSI ID OPEN OPEN OPEN 0 SHORT OPEN OPEN 1 OPEN SHORT OPEN 2 SHORT SHORT OPEN 3 OPEN OPEN SHORT 4 SHORT OPEN SHORT 5 OPEN SHORT SHORT 6 SHORT SHORT SHORT 7

Terminal CN6 Function Pin Result Spindle motor control A SHORT Auto start on power up OPEN Controlled by STAR/STOP UNIT command SCSI parity check P SHORT* Enabled OPEN Disabled Offline self-diagnostics D SHORT Execute diagnostics OPEN* Normal operation 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

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 29 30 GROUND GROUND 29 30 GROUND GROUND 33 34 GROUND GROUND 35 36 -BSY GROUND 37 38 -ACK GROUND 39 40 -RST GROUND 41 42 -MSG GROUND 45 46 -C/D GROUND 47 48 -REQ GROUND 49 50 -I/O Functional/Environmental specifications Functional specifications Form factor : 3.5 inch x half height Interface : SCSI-2, fast, single-ended maximum cable length = 6 metres Total storage capacity : RS stock no. 213-7384 RS stock no.213-7407 Formatted : 2.4GB 4.35GB Storage capacity/track Unformatted : 77,214 to 109,173 bytes (in 13 zones) Number of disks : 3 5 Number of heads : 5 DATA + 1 SERVO 9 DATA + 1 SERVO Number of cylinders : 5,713 Recording density : 83,603 - 118,737 bpi Track density : 6,438 tpi Recording method : PR4 ML Data transfer rate Disk drive : 11.3 Mb/sec maximum Asynchronous : 8 bit SCSI: 6Mb/s max./16 bit SCSI: 12Mb/s max. Synchronous : 8 bit SCSI: 10Mb/s max./16 bit SCSI:20Mb/s max. Rotational speed : 7200RPM ± 0.5% Average latency time : 4.17 milliseconds Positioning time (read/write): minimum : 0.8/1.0 milliseconds average : 8.0/9.0 milliseconds maximum : 17.0/18.0 milliseconds Power consumption 8 bit SCSI : Single-ended type 15.4 W typ Differential type 15.8 W typ 16 bit SCSI : Single-ended type 15.5 W typ Differential type 20.0 W typ Outer dimensions Width x height x depth : 101.6mm x 25.4mm x 146.0mm(without bezel) : 104.1mm x 25.4mm X 151.3mm (with bezel) Data buffer : 510 KB FIFO ring buffer and multi-segmented : (1 to 32) buffer with read-ahead cache feature Logical data block length : 180 to 4,1606 bytes (fixed length, selectable in 2 byte boundary settings at initialisation) Weight : 0.6kg MTBF : 1,000,000 power-on hours Motor start/stop time: start : 30 seconds typical stop : 30 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 Altitude range : 0 to 3,000 metres Vibration : Less than 1.0G (5Hz to 250Hz) Shock : Less than 5G (max. 10ms) Non-operating Temperature : -40¡C to 60¡C Temperature gradient : 15¡C per hour or less Relative humidity : 5% to 95% RH Maximum wet bulb temp : 29¡C Altitude range : 0 to 12,000 metres Vibration : Less than 5.0G (5Hz to 250Hz) Shock : Less than 50G (max. 10ms)

RS Components Issued July 1996 10543