Jumper Settings; Master/Slave Configuration; Cable-Select Option; Figure 3. Master/Slave Jumper Settings - Seagate ST3120020A Product Manual

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3.2

Jumper settings

3.2.1

Master/slave configuration

The options jumper block shown in Figure 3 is used to configure the drive for
operation. It is the 8-pin dual header between the interface connector and the
power connector. Use the following settings to configure the drive as a master
or a slave.
Master or single drive. The drive is configured at the factory for a master or
single-drive operation with a jumper set on pins 7 and 8.
Drive as slave. Remove all jumpers.
Drive as master with a non-ATA-compatible slave.
Use this jumper setting only if the drive does not work as a master with no
jumpers installed.
Figure 3. Master/slave jumper settings
3.2.2

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 3. Refer to your
computer manual to determine whether your computer supports this option.
Options jumper block
Master or single drive
Drive is slave
Master with non ATA-
compatible slave
Cable select
Limit drive capacity
to 32 Gbytes
7 5 3 1
8 6 4 2
U7 Product Manual, Rev. D
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