Grounding; Drive Termination - Seagate ST15150N - Barracuda 4.3 GB Hard Drive Product Manual

ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
10.3
10.4

Grounding

Signal ground (PCB) and HDA ground are connected together in the
Barracuda 4 family drives—do not separate this connection. Maximizing the
conductive contact area between HDA ground and system ground may
reduce radiated emissions. A bracket shield with tapped holes is available to
system integrators. This shield makes it easier to attach a braid or similar
high-frequency grounding device. If you do not want the system chassis to
be connected to the HDA/PCB ground, you must provide a nonconductive
(electrically isolating) method of mounting the drive in the host equipment;
however, this may increase radiated emissions and is the system designer's
responsibility.

Drive termination

ST15150N
To enable internal drive termination, install a jumper on J01 pins 1 and 2 as
shown in Figure 20.
ST15150ND
You must provide external drive termination when termination is required.
ST15150W
To enable internal drive termination, install a jumper on J4 pins 11 and 12 as
shown in Figure 22.
ST15150WD
You must provide external drive termination when termination is required.
ST15150WC
You must provide external drive termination when termination is required.
ST15150DC
You must provide external drive termination when termination is required.
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