Why Doesn't My Computer Display My D Drive?

The D drive is usually a CD-ROM or DVD-ROM.

In Windows, each hard drive and disk drive is assigned a letter. The D drive is most commonly a CD-ROM or DVD-ROM although it could be another drive, such as a hard disk, a floppy disk drive or an external plug-in device. Nevertheless, the reasons that a computer fails to recognize a drive tend to be the same no matter what drive is assigned as the D drive.

Lettering System for Drives

All hard drives, optical drives and related storage media are assigned a letter when they are connected to a Windows-based personal computer. By opening the "computer" section of Windows, the user can see all drives currently recognized by the computer. This list will display the drive letter, the type of drive associated with each letter, and if the drive is named or has media present, it will display that name. For example, the C drive is almost always the main hard disk and will be listed as a hard disk drive in this list. If drive D is a DVD-ROM and has a movie present, the list in the computer section will identify drive D as a DVD-ROM and list the name of the movie in the drive. If you plug a smart phone or other USB device into the computer, it will also appear here with an assigned letter and will classified as a "Device with Removable Storage."

Identifying a Missing Drive

When determining why the D drive did not show up, the first step a user should take is to determine if the drive has been recognized by the computer, but assigned a letter other than "D." To determine what letter was assigned to a particular drive, click "Start," "Computer" and scan the list that appears for the drive in question. A CD-ROM or DVD-ROM will typically be displayed as, "DVD Drive (D)" and may include the name of a DVD or CD that has been inserted into the drive. Scan the list for the drive in question. You may find that the computer has recognized the drive for which you are searching but has assigned it a different letter.

Hardware Problems

A good first step in troubleshooting an unrecognized drive is to check for damaged hardware. First, the drive itself should be tested to ensure it is still functional. Test the drive by connecting it to a second computer and checking if it works there. To be sure there are no problems on the second computer, it is best to unplug a working drive from the second computer and plug the unrecognized drive into its place. If the unrecognized drive works on the second computer, then you can be sure the drive is functional.

Second, the cord connecting the drive to the computer could be damaged. Connect the drive with a cord that is known to be working in order to eliminate cord damage as the cause.

Third, the connector on the motherboard could be damaged. Test this by removing a functional drive and plugging the drive in question into the same space on the motherboard. If the drive is recognized when plugged into this slot, then the plug on the motherboard is likely the problem.

Finally, the drive could have been "unmounted" in Windows, meaning that the computer stopped the drive so it could be safely unplugged. Test this by unplugging the device and reconnecting it.

Drive Letter Conflict

When a drive is plugged into a Windows computer, Windows automatically assigns it an identifying letter. Windows will occasionally assign the same letter to two drives. In this case, only one of the drives will be visible. For example, if you plug a CD-ROM into the computer and Windows assigns it the letter "C," this will most likely cause a conflict as the C drive is almost always the main hard disk. As a result, the CD-ROM will not be visible to the user. To fix this problem, select "Start," "Control Panel," "System and Security," "Administrative Tools" "Computer Management." This will bring up a list of all drives plugged into, and recognized by, the computer. If you see the drive for which you are looking, right-click on the name of the drive and select the option "assign letter" from the drop-down menu. Assign the drive a random letter not in use by another component. It will now be recognized and visible to the user.

References

• Windows: How to Add or Remove Drive Letters