Seagate BARRACUDA 9 ST19171WD - Manual (Page 20)

18 Barracuda 9 Installation Guide, Rev. B
2 A –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.
3 See the +12V current profile in the Barracuda 9 Product Man-
ual (publication number 83329030).
4 This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
5 See “Conducted noise immunity” in the Barracuda 9 Product
Manual. The specified voltage tolerance is inclusive of ripple,
noise, and transient response.
6 At 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.
7 Minimum current loading for each supply voltage is not less
than 4% of the maximum operating current shown.
8 Use separate ground returns for +5V and +12V supplies.
9 Where 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.
10 Operating condition is a third-stroke seek at OD and read one
Track. A command is issued every 0.075 seconds (every 0.063
seconds on wide and SCA drives).