Optical disc drive and hibernation recovery method for an optical disc drive

Abstract

The invention provides an optical disc drive and hibernation recovery method for the optical disc drive, capable of preventing a time-out from occurring on a host computer when a second command is received before writing is completed after the optical disc drive receives a write request and recovers from a hibernate state. Provided is a technology in which a controller for controlling read/write performed to/from an optical disc includes a processor for controlling an interface, a temporary memory unit, a rotation control unit, and an optical control unit. The controller causes the processor to shift to a hibernate state when a predetermined condition is satisfied, and causes the processor to recover from the hibernate state into an active state when the interface receives a first command. The processor receives the first command from the interface, instructs the rotation control unit to drive the optical disc at a predetermined target rotational speed, instructs the optical control unit to perform a processing specified by the first command, transmits a completion notification of the first command to the interface with a delay, receives a second command after transmitting the completion notification of the first command, and executes the processing of the second command.

Description

technical field [0001] The present invention relates to an optical disc device and a computer system having the optical disc device, and particularly relates to a control technique when returning from a standby state to an active state in an optical disc device which realizes power saving by shifting to a standby state or a rest state. Background technique [0002] In computer systems in recent years, not only improvement in processing capability but also reduction in power consumption is required. Therefore, a known power saving technique is to make the optical disc drive transition to a sleep state such as a sleep state (or a stop state, or a power saving state) when there is no access from a host computer in the optical disc drive (for example, Patent Document 1). . [0003] When the optical disk device receives a write command (WriteCommand) or a read command (Read Command) from the host computer in a state of rest, it rotates the stopped optical disk, and starts proces...

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Problems solved by technology

[0007] Since it takes several seconds or longer until the rotation speed of the optical disk reaches a value that allows writing, there is a problem that after the completion of the write process as a trigger for recovery from the pause state, the read process as the second command is completed. , the read-in processing in the host computer timed out

[0009] Furthermore, in the following Patent Document 2, the timeout time is set in advance. Therefore, due to the deviation in the accuracy of the mechanical parts, the time to reach the predetermined rotational speed from the stopped state may vary, and there is a possibility that the predetermined timeout time may be exceeded. The specified rotation speed cannot be reached within a timeout

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