Daddy Bob

DADDY BOB'S COMPUTER Q & A

 

March 29, 2009

Q. I installed a second hard drive, and now my CD drives have changed drive letters. Can I change the new hard drive to something other than the "D" drive?

A. Yes, you can change any of your drives to another drive letter. By default, Drive A and B are reserved for floppies, and although most new computers do not have a floppy, these are best not used for other devices.

Drive C is usually reserved for the root drive in Windows systems, and although the root drive can be anything, unless you are really sure you know what you are doing, it is best left at C. If your computer came with the restore files on the hard drive rather than on a CD or DVD, then it will usually be designated as the D drive. However, for the remaining drive possibilities, E through Z, you are pretty much free to assign any of these to whatever device you choose.

When you add devices, Windows will usually assign the next available letter to it by default, with one possible exception. If you have but one hard drive C, and you install a second hard drive, it will usually take the letter D and move all the other drives down one letter. I suspect that this is what you have experienced.

This can cause some programs to stop working correctly if they are expecting to find files on a drive that has changed. In this case, you can change the new drive to another drive letter and the process is similar in all versions of Windows since Windows 98. Note however, this drive letter change will probably not be permanent for removable drives like an external hard drive or a USB thumb drive if the drive is removed.

Right click on My computer on the desktop or in the Start menu and select Manage. Double click on Storage, then Disk Management and this dialog will be displayed. It has been reduced to fit on this page and is not as clear as desired. To see it full size, just click on it. Click Back to return to this article.

In the top section all the drives on the computer are listed along with information about that device. Note that the partitions are shown as separate drives even though they may be located on the same physical drive.

In the bottom section, all your disks are listed in the first column, and their description to the right. Hard drives are designated by numbers starting with zero, and the CDs or DVD are listed starting with CD-ROM 0. Note that even though your computer may have DVD writable drives, they are designated here as CD-ROMs.

Remember that so far as a computer is concerned, the number zero (0) is just as significant as any other number. Counting in a computer starts with 0 not 1 as we were taught in school. 

Disk 0 is the primary drive and in my case, it is divided into 4 partitions. The first is one used as part of the recovery system and the other three are my C, D and E drives. It is best that no changes be made to any drives that are part of the recovery system or the C drive. My external hard drive is shown as Disk 1, and designated as drive (H).

In the in case where another hard drive has been added, it will appear as Disk 1 and in the right pane be designated as drive (D). So, to change this drive to something other than the assigned Drive D, right click on the drive name in the right column. Select Drive letter and path from the menu and when the dialog opens, click on the Change button.  Click on the little down arrow next to the drive letter shown and a drop down list will display all the available letters. You can choose whatever you want and click OK.

You will be shown a message stating that if you change the drive letter that some programs may not work, but for most cases, this can be ignored and you just click Yes.

If the letter that you want to assign to a given device is already taken, then just change the device that has it to another one first. Other than drives A, B C, and any letter assigned to a recovery partition, there is nothing sacred about the drive letter assignments and they can be changed to whatever you like.

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