14 Barracuda 9 Installation Guide, Rev. A
2A –10% tolerance is permissible during initial start of the spin-
dle but must return to ±5% before reaching 7,200 RPM. The
±5% must be maintained after the drive signifies that its
power-up sequence has been completed and that the drive is
able to accept selection by the host initiator.
3See the +12V current profile in the
Barracuda 9 Product Man-ual (publication number 83329030).
4This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
5See “Conducted noise immunity” in the
Barracuda 9 ProductManual. The specified voltage tolerance is inclusive of ripple,
noise, and transient response.
6At power-up, the motor current regulator limits the +12V cur-
rent to an average value of less than 1.4A, although instanta-
neous peaks may exceed this value. These peaks should
measure 5 msec duration or less.
7Minimum current loading for each supply voltage is not less
than 4% of the maximum operating current shown.
8Use separate ground returns for +5V and +12V supplies.
9Where power is provided to multiple drives from a common
supply, carefully consider individual-drive power requirements.
Where multiple units are powered on simultaneously, be sure
the peak starting current is available to each device.
10Operating condition is a third-str oke seek at OD and read one
Track. A command is issued every 0.075 seconds (every
0.063 seconds on wide and SCA drives).