How to manage your disks using only Windows Vista's Disk Management tool.
Click on the Change button
From the Assign the following drive letter drop down list, select the new driver letter you want to assign and click on OK.
You will receive a warning stating that some programs might not run correctly if you change the drive letter. If you did not install any applications on that drive it should be OK to change it. Click on Yes and the drive letter change will be done.
For some partitions you will not be able to change the drive letter. This happens with partitions where you have installed an operating system, partitions on which you have page (swap) files or where boot information is stored.
How to shrink an existing partition
Select the partition you want to shrink, right click on it and select Shrink Volume.
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