Power Condition Page (1Ah); Table 5-82 Power Condition Page-(Page 1Ah) - Maxtor ATLAS 10K IV User Manual

SCSI Description
5.14.13

Power Condition Page (1Ah)

The Power Condition Page controls disk drive Power Management functions. Power
Management provides three sub-states of UNIT READY:
• ACTIVE: This is the state of highest power consumption for the disk
drive. A media access command is acted upon immediately by the drive.
• IDLE: This is a state of lower power consumption for the disk drive. A
media access command is acted upon after a delay of approximately one
second.
• STANDBY: This is the state of lowest power consumption for the disk
drive. A media access command is delayed by approximately 10
seconds before being acted upon.
Note that in all three sub-states, the drive remains READY.
Table 5-82 shows the data format of the page.
Table 5-83 contains a description of the Power Condition Page fields.
Bit
Byte
0
1
2
3
4 - 7
8 - 11
Table 5-83
Default
Field
Value
PS 0
IdlEnb 0
SbyEnb 0
Idle Timer 0
Standby
0
Timer
5-58 Maxtor Atlas 10K IV
Power Condition Page-(Page 1Ah)
Table 5-82
7 6 5
PS
Reserved
Power Condition Page-Field Descriptions (Page 1Ah)
Parameters Savable. This bit is only used with the MODE SENSE command. A re-
turned value of 1 indicates that the target is capable of saving the page in a non-vola-
tile, vendor-specific location. The bit is reserved with the MODE SELECT command.
Enable Idle Timer. This is a lower power consumption state of the drive. A media ac-
cess command waits for an approximately one second transition time delay from the
IDLE to the ACTIVE state.
Enable Standby Timer. Any media access command waits for an approximately 10
second transition time delay from the STANDBY to the ACTIVE state.
The Idle Timer specifies the time, in 100-millisecond increments, before entering the
IDLE state after the last media access command. The IdlEnb field must be set to 1.
The internal minimum value for this field is 60 seconds.
The Standby Timer specifies the time, in 100-millisecond increments, before entering
the Standby state after the last media access command. The SbyEnb field must be set
to 1. The internal minimum value for this field is 15 minutes.
4 3 2
Page Code (1Ah)
Page Length (0Ah)
Reserved
Idle Timer
Standby Timer
Description
1 0
IdlEnb SbyEnb