D:

D: is a PC drive letter often assigned to the CD-ROM (compact disc read-only memory) or other disc drive. Computers with one hard drive and partition automatically assign the CD-ROM or other disc drive as the D: drive. However, this drive can be any drive letter, but is often assigned as the last physical drive letter. The picture below is an example of the DVD-RW (digital versatile disc read/write) drive, which is assigned as the E: drive.

A:, C:, CD terms, Drive letter