IBM IC25N020ATDA04 Hard Drive Specifications - Page 97

Power management features, 5.1 Power Mode, 5.2 Power management commands

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LBA addressing mode Logical sectors on the device shall be linearly mapped with the first LBA addressed sector (sector 0) being the same sector as the first logical CHS addressed sector ( cylinder 0, head 0, sector 1). Irrespective of the logical CHS translation mode currently in effect, the LBA address of a given logical sector does not change. The following is always true: LBA = ((cylinder*heads_per_cylinder+heads)*sectors_per_track)+sector-1 where heads_per_cylinder and sectors_per_track are the current translation mode values. On LBA addressing mode the LBA value is set to the following register: Device/Head Cylinder High Cylinder Low Sector Number

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LBA addressing mode
Logical sectors on the device shall be linearly mapped with the first LBA addressed sector (sector 0)
being the same sector as the first logical CHS addressed sector ( cylinder 0, head 0, sector 1). Irre-
spective of the logical CHS translation mode currently in effect, the LBA address of a given logical sector
does not change. The following is always true:
LBA = ((cylinder*heads_per_cylinder+heads)*sectors_per_track)+sector-1
where
heads_per_cylinder
and
sectors_per_track
are the current translation mode values.
On LBA addressing mode the LBA value is set to the following register:
<---- LBA bits
7- 0
Sector Number
<---- LBA bits 15- 8
Cylinder Low
<---- LBA bits 23-16
Cylinder High
<---- LBA bits 27-24
Device/Head
11.5 Power management features
The power management feature set permits a host to modify the behavior in a manner which reduces the
power required to operate. The power management feature set provides a set of commands and a timer
that enables a device to implement low power consumption modes.
The drive implements the following set of functions.
1. A Standby timer
2. Idle command
3. Idle Immediate command
4. Sleep command
5. Standby command
6. Standby Immediate command
11.5.1 Power Mode
The device is in execution of a command or accessing the disk media with the read
look-ahead function or the write cache function.
Active Mode
Refer to Section 11.6, "Adaptive Power Management (ABLE-3) feature" on page 85.
Idle Mode
The device interface is capable of accepting commands, but as the media may not be
immediately accessible, there is a delay while waiting for the spindle to reach
operating speed.
Standby Mode
The lowest power consumption when the device is powered on occurs in Sleep Mode.
When in sleep mode, the device requires a reset to be activated.
Sleep Mode
11.5.2 Power management commands
The Check Power Mode command allows a host to determine if a device is currently in, going to, or
leaving standby mode.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
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