When you try to Copy Disk a second time, the Diskcopy.dll library issues and access violation in the Rundll32.exe process.

To workaround this issue, use the diskcopy command:

diskcopy \[drive1: \[drive2:\]\] \[/v\]

where drive1: is the source disk and drive2: is the destination disk. The /v parameter verifies that the information is copied correctly, which will slow the process.

NOTE: See DiskCopy A: A: issues Cannot lock the drive. The volume is still in use. Copy process ended. Copy another disk (Y/N)?