How to troubleshoot Win7 the physical optical drive is not available after the virtual optical drive is installed

Small Common sense:

Virtual Optical drive: is a simulation (cd/dvd-rom) Work of the tool software, you can build and your computer installed on the CD-ROM optical disk image, the normal optical drive can do the same thing as a virtual CD-ROM drive.

Physical optical drive: Generally speaking of the optical drive is the physical optical drive, CD-ROM in the CD-ROM high-speed rotation, the magnetic head through the laser to read the data recorded on the surface of the disc, using the physical principle.

　　Workaround:

1, open the Run dialog box and run Regedit, return to open Registry Editor;

2, then expand the positioning to HKEY-LOCAL-MACHINEENUMSCSI branch;

3, then in the right side of the window can be found in the system installed the optical drive information, find the string key value entry Userdrive-letterassignment, which refers to the system is assigned to the CD-ROM drive the available letter, such as Hz means that from H to Z can be used for the optical drive.

4, then delete all the subkeys under the SCSI subkey, so that the physical optical drive and the virtual CD drive are removed.

5, the last restart computer, the system will automatically find the physical optical drive, and will be the above subkey added to the physical optical drive information, so that the physical CD-ROM can be used.