The optical disk drive on a ThinkPad X300 computer that is running Windows Vista is not recognized after you perform a suspend-and-resume cycle or a hibernate-and-wake cycle on the computer
Consider the following scenario:
- On a ThinkPad X300 computer that is running Windows Vista, you enable the Disable optical drive option on the Power Management tab.
- You perform a suspend-and-resume cycle or a hibernate-and-wake cycle on the computer.
In this scenario, the computer’s optical disk drive is intermittently not displayed in My Computer or in Device Manager.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB949634.

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