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1. Click Start, point to Settings, and then click Control Panel.
2. Double-click the System icon, and then click the Device Manager tab.
3. Click the CD-ROM drive you want to change, and then click the Properties button.
4. Click the Settings tab.
5. In the Reserved Drive Letters section, set Start Drive Letter and End Drive Letter to the drive letter you want the CD-ROM drive to use. Click OK until you return to Control Panel.
6. Restart the computer.
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1. Log on as Administrator or as a member of the Administrators group.
2. Click Start, click Control Panel, and then click Performance and Maintenance.
3. Click Administrative Tools, double-click Computer Management, and then click Disk Management in the left pane.
4. Right-click the drive, the partition, the logical drive, or the volume that you want to assign a drive letter to, and then click Change Drive Letter and Paths.
5. Click Change.
6. Click Assign the following drive letter if it is not already selected, click the drive letter that you want to use, and then click OK.
7. Click Yes when you are prompted to confirm the drive letter change.
The drive letter of the drive, the partition, or the volume that you specified is changed, and the new drive letter appears in the appropriate drive, partition, or volume in the Disk Management tool.