Seagate BARRACUDA 9 Installationsanleitung PDF herunterladen (Seite 20)

18 Barracuda 9 Installation Guide, Rev. B

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.

See the +12V current profile in the

Barracuda 9 Product Man-

ual

(publication number 83329030).

This condition occurs when the Motor Start option is enabled

and the drive has not yet received a Start Motor command.

See “Conducted noise immunity” in the

Barracuda 9 Product

Manual.

The specified voltage tolerance is inclusive of ripple,

noise, and transient response.

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.

Minimum current loading for each supply voltage is not less

than 4% of the maximum operating current shown.

Use separate ground returns for +5V and +12V supplies.

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.

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).

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Seagate BARRACUDA 9 Installationsanleitung Seite 20