U Series CE Family Product Manual, Rev. A
19
2.2.2 Cable-select option
Computers that use cable-select determine the master and slave drives
by selecting or deselecting pin 28, CSEL, on the interface bus. Master
and slave drives are determined by their physical position on the cable.
To enable cable select, set a jumper on pins 5 and 6 as shown in Figure
2 on page 18. Refer to your computer manual to determine whether your
computer supports this option.
2.2.3 Alternate capacity jumper
Some older computers may “hang” at startup if their BIOS detects a hard
drive that has values greater than either 4,092 (2.1 Gbytes) cylinders or
approximately 32 Gbytes. To eliminate this problem, the drive includes
a capacity-limiting jumper that sets the drive’s default translation geometry
to 4,092 cylinders for model ST320410ACE and limits the drive’s capacity
to 2.1 Gbytes. The ST380020ACE, ST360020ACE and the ST340810ACE
are limited to 32 Gbytes when the alternate capacity jumper is used. To
realize the full capacity of the drive, you can use third-party software
such as DiscWizard or Disk Manager.
If the alternate capacity jumper is used on drives under 32 Gbytes, the
drive’s true LBAs are found in ID words 60 and 61. On larger-capacity
drives, the alternate capacity jumper “freezes” words 60 and 61 at a value
below the problem barrier point. The ATA Set Max command is used to
“unfreeze” and fill the real values in words 60 and 61 after the command
is issued.
Windows 98 or newer versions are needed to support drives with
capacities greater than 32 Gbytes.
2.2.4 Ultra ATA/100 cable
An 80-conductor 40-pin cable is required to run Ultra DMA mode 3, mode
4 and mode 5. This cable uses even-numbered conductors connected
to the ground pins to improve signal integrity.
Notes:
1. The drive supports both host and drive cable detection. The host
detects the 80-conductor cable by sampling pin 34, CBLID–, on
the interface bus. The drive detects the 80-conductor cable by
sensing a capacitor at the host side through the CBLID– signal.
The result is reported in a Fast Rise Detected bit (bit 13 of word
93 in the Identify drive parameter block).
2. When using a 40-pin 80-conductor cable, attach the
blue
con-
nector to the motherboard, the
black
connector to the master
drive, and the
grey
connector to the slave.
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