50 Chapter 2
device change is only for one-time change. In other words, when the system is rebooted, the boot
device sequence will be the same as the one defined in the BIOS setup (Boot option).
•D2D Recovery: It allows the users to enable or disable the disk-to-disk recovery.
•Processor Power Management: To save power in working state, the OS leads the CPU to low-power
states (C1, C2 and C3) when the OS is idle. In the low-power state, the CPU does not run any
instructions, and wakes up when an interruption, such as the OS scheduler’s timer interruption, occurs.