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16 Barracuda XT SATA Product Manual, Rev. D
Drive Specifications www.seagate.com
2.6.1 Conducted noise
Input noise ripple is measured at the host system power supply across an equivalent 80-ohm resistive load on the
+12V line or an equivalent 15-ohm resistive load on the +5V line.
• Using 12-V power, the drive is expected to operate with a maximum of 120 mV peak-to-peak square-wave
injected noise at up to 10MHz.
• Using 5-V power, the drive is expected to operate with a maximum of 100 mV peak-to-peak square-wave
injected noise at up to 10MHz.
2.6.2 Voltage tolerance
Voltage tolerance (including noise):
5V + 5%
12V + 10 %
2.6.3 Power management modes
The drive provides programmable power management to provide greater energy efficiency. In most systems, you
can control power management through the system setup program. The drive features the following power
management modes:
• Active mode
The drive is in active mode during the read/write and seek operations.
• Idle mode
The buffer remains enabled, and the drive accepts all commands and returns to active mode any time disk
access is necessary.
• Standby mode
The drive enters standby mode when the host sends a standby Immediate command. If the host has set the
standby timer, the drive can also enter standby mode automatically after the drive has been inactive for a
specifiable length of time. The standby timer delay is established using a standby or idle command. In standby
mode, the drive buffer is enabled, the heads are parked and the spindle is at rest. The drive accepts all
commands and returns to active mode any time disk access is necessary.
• Sleep mode
The drive enters sleep mode after receiving a sleep command from the host. In sleep mode, the drive buffer is
disabled, the heads are parked and the spindle is at rest. The drive leaves sleep mode after it receives a hard
reset or soft reset from the host. After receiving a reset, the drive exits sleep mode and enters standby mode
with all current translation parameters intact.
• Idle and Standby timers
Each time the drive performs an active function (read, write or seek), the standby timer is reinitialized and
begins counting down from its specified delay times to zero. If the standby timer reaches zero before any drive
activity is required, the drive makes a transition to standby mode. In both Idle and standby mode, the drive
accepts all commands and returns to active mode when disk access is necessary.
Note
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/
write current.
Power modes Heads Spindle Buffer
Active Tracking Rotating Enabled
Idle Tracking Rotating Enabled
Standby Parked Stopped Enabled
Sleep Parked Stopped Disabled