Alternate Capacity Jumper; Ultra Ata/100 Cable; Figure 4. Ultra Ata Cable Connectors - Seagate ST3120020A Product Manual

U7 Product Manual, Rev. D
3.2.3

Alternate capacity jumper

Some older computers may "hang" at startup if their BIOS detects a disc drive
with a capacity greater than 32 Gbytes. This limits the drive's capacity to 32
Gbytes when the alternate capacity jumper is used. To access the full capacity
of the drive, you can:
• Update the BIOS
• Use third-party software such as DiscWizard
• Use a third-party host adapter
For drives with capacities greater than 32 Gbytes, the alternate capacity jumper
changes the total available LBA sectors to 32 Gbytes to solve issues with some
BIOS during power on. The ATA Set Features subcommand "F1
Capacity Available" causes Identify Data words 60 and 61 to report the full
capacity. See Section 4.1.3 on page 33 for more details on the Set Features
command.
Windows XP, Windows Me, Windows 98 or newer versions are needed to
support drives with capacities greater than 32 Gbytes.
3.2.4

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.
Master
Slave
Figure 4. Ultra ATA cable connectors
Note. 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).
Note. If you are using a 40-pin 80-conductor
Pin 1
C o
m p
M o
u t e
t h e
r b o
a r d
™
or Disk Manager
cable, attach the blue connector to the
motherboard, the black connector to the
master drive, and the grey connector
to the slave.
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