Hitachi HDS723020BLA642 - Interface Capability for Power Modes; Table 31 Power Conditions

Hitachi hard disk drive specifications
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9.4.4 Interface Capability for Power Modes
Each power mode affects the physical interface as defined in the following table:
Mode
BSY
RDY
Interface active
Media
Active
x
x
Yes
Active
Idle
0
1
Yes
Active
Standby
0
1
Yes
Inactive
sleep
x
x
No
Inactive
Table 31 Power conditions
Ready (RDY) is not a power condition. A device may post ready at the interface even though the media may not
be accessible.