Seagate Barracuda ST11950N, Product Manual

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52 Barracuda 1 and 2 Product Manual, Rev. C
10.3 Grounding
Signal ground (PCB) and HDA ground are connected together in the
Barracuda 1 and 2 family drives—do not separate this connection. Maximiz-
ing the conductive contact area between HDA ground and system ground
may reduce radiated emissions. If you do not want to connect HDA ground
to the system chassis, you must provide a nonconductive (electrically
isolating) method of mounting the drive in the host equipment. This may
increase radiated emissions and is the system integrator’s responsibility.