Hitachi 7K100 Hard Drive Specifications - Page 85
Advanced Power Management ABLE-3 feature
UPC - 683728198671
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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 Active Idle Standby Sleep BSY x o o x RDY x 1 1 x Interface active Yes Yes Yes No Media Active Active Inactive Inactive 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 Travelstar 7K100 Hard Disk Drive Specification 71