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11.6.4 Standby timer
The standby timer provides a method for the device to automatically enter standby mode from either active or idle
mode following a host programmed period of inactivity. If the device is in the active or idle mode, the device waits
for the specified time period and if no command is received, the device automatically enters the standby mode.
If the value of the SECTOR COUNT register on Idle command or the Standby command is set to "00h", the device
will automatically set the standby timer to 109 minutes.
11.6.5 Status
In the active, idle, and standby modes, the drive shall have the RDY bit of the status register set. If the BSY bit is
not set, the drive shall be ready to accept any command.
In sleep mode, the drive interface is not active. A host shall not attempt to read the status of the device or issue
commands to the drive.
11.6.6 Interface capability for power modes
Each power mode affects the physical interface as defined in the following table:
Table 50: Power conditions
Mode
BSY
Active
x
Idle
o
Standby
o
Sleep
x
Ready (RDY) is not a power condition. A device may post ready at the interface even though the media may not be
accessible.
The interface is inactive in sleep mode, but the access to the interface registers and the validity of INTRQ is
guaranteed for two seconds after the Sleep command is completed. After this period, the contents of interface
registers may be lost. Since the contents of interface registers may be invalid, the host should NOT check the Status
register nor the Alternate Status register prior to issuing a soft reset to wake up a device.
11.6.7 Initial Power Mode at Power On
After power on or hard reset the device goes to IDLE mode or STANDBY mode depending on the option. Refer to
section 4.4.3 "Operating modes" on page 16 for the initial power mode selection.
11.7 Advanced Power Management (ABLE-3) feature
This feature provides power saving without performance degradation. The Adaptive Battery Life Extender 3
(ABLE-3) technology intelligently manages transition among power modes within the device by monitoring access
patterns of the host.
This technology has three idle modes: Performance Idle mode, Active Idle mode, and Low Power Idle mode.
This feature allows the host to select an advanced power management level. The advanced power management level
is a scale from the lowest power consumption setting of 01h to the maximum performance level of FEh. Device
performance may increase with increasing advanced power management levels. Device power consumption may
RDY
Interface active
x
Yes
1
Yes
1
Yes
x
No
Travelstar 7K100 Hard Disk Drive Specification
Media
Active
Active
Inactive
Inactive
71
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