Installation
3−10 Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
Table 3-2 Jumper Settings for SCSI ID, 28-Pin Secondary Option Connector
Jumper Location – Secondary Option Connector
SCSI ID Pin Pair 7 / 8 Pin Pair 5 / 6 Pin Pair 3 / 4 Pin Pair 1 / 2
0 0 0 0 0
1 1 0 0 0
2 0 1 0 0
3 1 1 0 0
4 0 0 1 0
5 1 0 1 0
6 0 1 1 0
7 1 1 1 0
8 0 0 0 1
9 1 0 0 1
10 0 1 0 1
11 1 1 0 1
12 0 0 1 1
13 1 0 1 1
14 0 1 1 1
15 1 1 1 1
0 = Jumper Not Installed
1 = Jumper Installed
3.4.1.3 Write Protection (Disk Drives with 68-Pin SCSI Connector)
To configure Write Protection for the drive, install a jumper across pin pair 19 / 20
on the Secondary Option Connector (Figure 3-4). To disable Write Protection on the
drive, remove the jumper.
3.4.1.4 Spin Up (Disk Drives with 68-Pin SCSI Connector)
Atlas 10K II Ultra 160/m SCSI drives have three Spin Up modes:
• Option 1: Spin up immediately when power is applied: Verify that no jumper
is installed across pin pair 11 / 12 (GND / Spin Delay) of the
Secondary Option connector (Figure 3-4).
• Option 2: Spin up after a predetermined delay following power on: Install
jumpers across pin pair 11 / 12 (GND / Spin Delay) and across pin
pair 21 / 22 (GND / Stagger Spin) on the Secondary Option
connector (Figure 3-4). Set the delay parameters with the MODE
SELECT command, Quantum-Unique Page (39h). The delay is equal
to a user-specified multiplier, multiplied by the numerical SCSI ID of
the drive. This will give a staggered spin-up in multiple-drive
installations.
• Option 3: Spin up on START STOP UNIT command: Install a jumper across
pin pair 11 / 12 (GND / Spin Delay) and remove any jumper from
pin pair 21 / 22 (GND / Stagger Spin), if a jumper is installed there,
on the Secondary Option connector (Figure 3-4).
