change drive letter batch

Change Drive Letter

Description.

This script will check for a drive on a drive letter and if it finds a drive there it will move it the a new drive letter. This is great when you clone a computer that has a USB multi card reader which takes the top few drive letters and you have home drives mapped to one of those drive letters.

Source Code

Great script, works perfectly - exactly the kind of thing I was looking for - thanks

Did not work on Windows 2008 R2 SP1. It says “%%a was unexpected at this time.”

Ilkin, try saving this as a .bat and running it that way. This type error is normally because of a copy and paste, in which case the %%'s need to be change to single %'s. I just tested on 08r2 and it worked for me so let me know how it goes.

This is exactly what I was looking for. Many thanks!

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Using current drive letter in batch script on a usb drive which changes drives letters

Following on from lasts week tip about Robocopy, if you are backing up to a USB drive there is a chance that every time you use the drive (maybe on different machines) under Windows you get a different drive letter.

So if you have a batch file saved on the drive with your finely crafted backup script, it may fail if your drive D:\ is now drive E:\

Enter to the rescue just the variable you need:

Which gives you the path to the file in which the script is being run from,

so something like

robocopy \\my-server\files %~d0\backupfolder /mir

saved as ‘backup.bat’ in the root of your usb drive will work everytime.

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Change Directory - Select a Folder (and drive)

CHDIR is a synonym for CD.

Tab Completion

Tab completion allows changing the current folder by entering just part of the path and pressing TAB. C:> CD Prog [PRESS TAB] Will go to C:\Program Files\ Tab Completion is disabled by default, it has been known to create difficulty when using a batch script to process text files that contain TAB characters. Tab Completion is turned on by setting the registry value shown below: REGEDIT4 [HKEY_CURRENT_USER\Software\Microsoft\Command Processor] "CompletionChar"=dword:00000009

A Current Directory for each drive?

Originally in MS-DOS, each drive had its own current directory, for complex historical reasons . Now in Win32, there is one global current directory, but at the command line the appearance is still maintained that each drive has its own current directory, this is a fake-out by cmd.exe. The location for each drive is stored using the undocumented environment variables =A: , =B: , =C: etc. The only reason you need to be aware of this is that GUI Windows applications may have a different current directory than the command prompt. Similarly two CMD sessions can each have a different current directory.

Errorlevels

If the Current directory was changed: %ERRORLEVEL% = 0 If the Directory does not exist or is not accessible or if a bad switch given: %ERRORLEVEL% = 1

CHDIR is a synonym for CD

CD is an internal command.

Change to the parent directory:

C:\Work> CD ..

Change to the grant-parent directory:

C:\Work\backup\January> CD ..\..

Change to the ROOT directory:

C:\Work\backup\January> CD \

Display the current directory in the specified drive:

C:\> CD D:

Display the current drive and directory:

C:\Work> CD

C:\Work> ECHO "%CD%"

In a batch file to display the location of the batch script file (%0) :

C:\> ECHO "%~dp0"

In a batch file to CD to the location of the batch script file (%0):

C:\> CD /d "%~dp0"

Move down the folder tree with a full path reference to the ROOT folder:

C:\windows> CD \ windows\java C:\windows\java>

Move down the folder tree with a reference RELATIVE to the current folder:

C:\windows> CD java C:\windows\java>

Move up and down the folder tree in one command:

C:\windows\java> CD ..\system32 C:\windows\system32>

Change the Current Drive , Enter the drive letter followed by a colon:

C:> E: E:>

To change drive and directory at the same time:

C:> cd /D E:\utils E:\utils\>

If Command Extensions are enabled, which they are by default, the CD command is enhanced as follows:

The current directory string is not CASE sensitive. So CD C:\wiNdoWs will set the current directory to C:\Windows CD does not treat spaces as delimiters, so it is possible to CD into a subfolder name that contains a space without surrounding the name with quotes. For example: cd \My folder is the same as: cd "\My folder" An asterisk can be used to complete a folder name: e.g. C:> CD pro* will move to C:\Program Files\

“Change is the law of life. And those who look only to the past or the present are certain to miss the future” ~ John F. Kennedy

Related commands

MD - Create Directory. pushd - Change Directory. RD - Delete directory or entire directory tree. How-to: Long filenames, NTFS and legal filename characters . Q156276 - Cmd does not support UNC names as the current directory. Equivalent PowerShell: Set-Location - Set the current working location. Equivalent bash command (Linux): cd - Change Directory.

How-To Geek

How to change a drive letter on windows 10 or windows 11.

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Proton pass now has secure login sharing, thunderbird's big "nebula" update is now available, quick links, what changing a drive letter does, how to change a drive letter, how to fix programs broken by changing a drive letter.

Changing the letter of a drive is easy on Windows 10 and Windows 11, but you should do it as soon as you add the drive to prevent future hassles. Find out how to change a drive letter here.

Windows assigns drive letters alphabetically --- starting with C --- when they're initialized. If you want to change a drive letter, you should do it before you install anything on the drive. Changing a drive letter after programs are installed could break them since there will be references to an installation location that is no longer there.

Windows has gotten pretty smart about updating shortcuts so that programs work after changing a drive letter. Most of your applications' shortcuts will probably be automatically corrected. Unfortunately, Windows isn't as good about updating file associations. You'll have to manually set the default apps associated with files to fix file associations if they were broken by changing the drive letter.

It is possible to change the boot drive letter to something else, but we don't recommend it. Changing C:\ to another letter is likely to result in severe issues, like a PC that cannot boot into Windows at all. Even if it were able to boot, there would be a huge number of programs that would not be able to run.

Technically speaking, while they are commonly called drive letters, each letter actually refers to a partition on a disk. If you have multiple partitions on a single disk, you will need to assign a letter to each partition to make them all accessible. If a disk has just a single partition, it will just have a single letter pointing to that partition. (However, you do not have to assign a letter to each partition. Partitions without drive letters will not appear in File Explorer and elsewhere.)

Changing a drive letter is pretty simple. Click the Start button, type "Disk Management" in the search bar, and then hit Enter.

The program name displayed in the search will not be Disk Management. It will be "Create and format hard disk partitions."

You could also hit Windows+X or right-click the Start button, and then click "Disk Management."

Identify the drive you'd like to change in the Disk Management Window. In this example, we'll change the letter of the D:\ drive to J:\. You can right-click the drive on the text list, or on the menu below. Either works.

Select "Change Drive Letter and Paths" in the right-click menu that appears.

In the window that pops up, click "Change."

Select whatever letter you want from the drop-down menu. Then click "Ok."

Two popups will warn you about changing your drive letter. Click "Yes" on both of them, and then restart your computer.

Once Windows has restarted, the drive letter should be changed.

There are a few ways you can fix a program broken by changing the drive letter.

Fix The Shortcut

If you're lucky, the only thing that is broken is the shortcut. Fix a shortcut by right-clicking the shortcut on your desktop, and then click Properties.

You need to change the target of the shortcut to the new drive letter.

For example, if GIMP was previously installed at " D :\GIMP 2\bin\gimp-2.10.exe," and you changed the D drive to J, change the target of the shortcut to " J :\GIMP 2\bin\gimp-2.10.exe."

Finalize the change by clicking "Apply" and then "Ok."

Reinstall the Program

Reinstalling the program will generate new entries in the registry, so everything on the computer will know where to look for the program. Some installers won't like reinstalling directly over existing files, so you may need to rename or delete the old installation first.

Change the Drive Letter Back

If you changed the drive letter of a drive with a lot of programs installed, it might be easier to change the drive letter back. Changing the drive letter back should automatically fix any programs and file associations that were broken.

Edit the Registry

You can break programs, or even Windows itself, by editing the registry. Be careful, and learn about how to edit the registry before you try it. Make sure you backup the Windows registry first. You should not attempt this method unless you have no other options.

Windows, and a lot of programs, track where programs are installed via the Windows registry. It is possible to manually adjust the registry to fix broken programs. Keep in mind that there could be dozens of registry entries you need to edit. A program like GIMP can have registry entries for the context menu, for the "Open With" menu, for any file associations, and for the location of its executables. Other programs may only have a few entries related to where it is installed.

If you're not deterred, here's how you do it.

First, you need to know where the program was previously installed. In this case, the program was installed to the "D:\GIMP 2" folder, and the executables were found the "D:\GIMP 2\bin" sub-folder. It is now located at "J:\GIMP 2" instead.

We need to update the registry to reflect the change in location. Click the Start button, type "regedit" into the search bar, right-click Regedit, and click "Run as administrator."

In Regedit, hit Ctrl+F to bring up a search window. Type in the old location for the program you're trying to fix --- "D:\GIMP 2" for our example --- then click "Find Next."

Once Regedit has found something with "D:\GIMP 2" as part of a path, it'll show it to you. Here is an example from the GIMP search.

To actually change them, double click the name of the registry entry you want to modify. Then change the drive letter to J, or whatever you chose. If you didn't otherwise move the folder, leave the rest of the path alone. Then click "Ok."

You'll need to repeat this multiple times. To find the next result using your search term, you can hit the F3 key. There will be a popup once you've found all of the entries.

Changing drive letters can be a simple way to customize your PC. Do it before you install anything on the drive, however. You'll prevent any problems before they occur, and probably save yourself quite a bit of troubleshooting.

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How to get a list of drive letters on a system through a windows shell (bat, cmd)?

How do I get a list of drive letters and their associated labels on a windows system through a bat file?

• windows-command-prompt

14 Answers 14

This will get most of it:

If you have any drives mapped via subst you would also need to get those:

For completeness, you would do it like this in Powershell (if you are on windows 7 or have installed it):

You can also do it from the command prompt or a batch file using WMI like this:

• 1 This doesn't list local disk drives like any internal hard drives or cdroms. Am I missing something? –  Chris Magnuson Commented Sep 4, 2009 at 21:12
• Nope, I misunderstood the question. I thought that you only wanted mapped drives. I will edit. –  EBGreen Commented Sep 4, 2009 at 21:18
• 2 The wmic solution should give you everything. –  EBGreen Commented Sep 4, 2009 at 21:20
• You need to remove the quotes from wmic logicaldisk get "caption,providername,drivetype" so that it is wmic logicaldisk get caption,providername,drivetype other wise it throws an error. EBGreen you have single handedly blown my mind for the day, I have never seen wmic even though I have been scripting various server builds for weeks and I am extremely excited to see what else I can do with it. Great job! –  Chris Magnuson Commented Sep 4, 2009 at 21:24
• 1 wmic logicaldisk get caption,providername,drivetype,volumename the VolumeName was what I was missing, if you update yours with that I will accept it as the answer. Thanks –  Chris Magnuson Commented Sep 4, 2009 at 21:31

To use diskpart, there is no need to create an intermediate file. Try:

• 2 This is the best answer and returns the most info about the mounted drives in a beautiful format. –  ekerner Commented May 29, 2013 at 7:41
• 1 but it requires admin rights –  LogicDaemon Commented Mar 1, 2017 at 7:56

Fast, flexible and efficient. Although a little complex.

• I don't know what versions of Windows this works on but I just tested it on my Win 7 and XP machines and got the following output from both: ` DRIVE LETTER(s):USED: " =" DRIVE LETTER(s):FREE: "!TMP_FREE_DRIVE_LETTERS!"` –  John Gardeniers Commented May 12, 2011 at 0:44
• Sorry, you need to put this in the beginning of the batch file. setlocal enabledelayedexpansion –  Dharma Leonardi Commented May 12, 2011 at 3:19
• I've edited your answer to include the missing line. It works now. +1 –  John Gardeniers Commented May 12, 2011 at 3:31

inspired by Scott

also shows CD drive letters and network mounted disk letters. No need to have admin rights.

• simple and works –  Tyler Liu Commented Feb 27, 2013 at 10:13
• "i was unexpected at this time." –  Berit Larsen Commented Sep 7, 2015 at 9:05
• @BeritLarsen you need to double up % symbols if running it as a batch file rather than on the command line. –  TessellatingHeckler Commented Oct 26, 2016 at 0:02

If anyone is lucky enough to be using Vista (Vista Ultimate SP2 b6002, in my case) and the gwmi and wmic snippets given here don't work exactly, here is what I did to make it work.

For gwmi , if you receive no output, try changing the DriveType to 3. If still having problems, remove the -filter option altogether and analyze output.

For wmic , if you receive "Invalid GET Expression", then try putting the get expression in quotes:

sample output

This site has a much simpler set of calls:

http://en.code-bude.net/2013/02/23/show-all-drives-in-command-prompt/

Show local drives:

wmic logicaldisk get deviceid, volumename, description

If you want to show only drives of a particular type, the wmic command can be further expanded to include a where clause.

wmic logicaldisk where drivetype=2 get deviceid, volumename, description

0 => Unknown

1 => No Root Directory

2 => Removable Disk

3 => Local Disk

4 => Network Drive

5 => Compact Disc

6 => RAM Disk

• I tried this one and it didn't work. I think there needs to be a space in front of the /s but even with that change it didn't work. I put the above in a file, d.bat and I see the diskpart window flash up but then disappear and the cmd shell where I'm running this then shows the pause running. –  slm Commented Dec 21, 2011 at 3:27

I found the diskpart approach reports DVD drives with no disc inserted, and doesn't report SD cards with valid drive volumes

• does not work for windows xp –  Tyler Liu Commented Feb 27, 2013 at 10:15

Somewhat kludgy, but works from a batch file:

Although it has enough answer, I'd like to add one when you want to use it in batch file. If you get "Invalid GET Expression", you could put a ^ before the ',', like below:

• What does this ^ do here? –  vonbrand Commented Mar 27, 2013 at 10:10
• It is cmd.exe's escape character, similar to \ in Unix like shells. –  gimpf Commented May 12, 2013 at 11:39

Using wmic in a for loop to determine all the available drives.

There is also this little hack using exit codes 65 to 90 converted to ascii which will return all Alpabetical characters A to Z with all credit to Aacini.

• Um, wow. So if you can distill that into something that would actually just output the drive letters and labels that exist on the system that would be closer to the answer to the question though this is it least movement in the right direction. –  Chris Magnuson Commented Sep 4, 2009 at 21:16
• I'm getting down-voted for providing a solution that meets the criteria? Wow... –  Scott Commented Sep 5, 2009 at 5:19
• 4 Well, for one thing, it produces errors for drives that exist but contain no media, such as a CD/DVD drive. –  Dennis Williamson Commented Sep 6, 2009 at 12:47

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How to Change Drive Letter with CMD Windows 10

Diskpart is a command-line tool in Windows system that allows you to manage your disks and partitions. This post introduces how to change drive letter with CMD in Windows 10, namely, by using Diskpart CMD tool. MiniTool software provides users a free disk partition manager, data recovery software, system backup and restore software, etc.

If you want, you can change drive letter for a drive with CMD (Command Prompt) in Windows 10. This post includes detailed guides for how to use Diskpart command-line tool to change driver letter in CMD.

How to Change Drive Letter with CMD in Windows 10

Diskpart is a Windows built-in CMD tool that lets you easily manage hard drive and change drive letter. To change or assign drive letter in CMD, you can firstly open Diskpart utility in Command Prompt. Check the steps below.

Step 1. Open CMD in Windows 10

You can press Windows + R , type cmd , and press Ctrl + Shift + Enter to open elevated Command Prompt .

Step 2. Open Diskpart tool

In Command Prompt window, you can type diskpart command, and press Enter . This will open the Diskpart command-line utility.

Step 3. Change drive letter CMD

Next you can type the command line below to change drive letter in Command Prompt in Windows 10. Remember to press Enter after typing each command line.

• list volume (this command will list all available volumes detected by your computer)
• select volume * (replace “*” with the exact volume number of the target partition)
• assign letter=* (replace “*” with the preferred drive letter like “F”)

After you change or assign a drive letter for a drive or device, Windows will display the same letter automatically next time you reconnect the device to your computer.

If you want to remove the drive letter of a specific drive, you can type remove letter=* command and press Enter . Still, replace “*” with the exact drive letter of the target drive.

How to Change Drive Letter Using PowerShell

Some Windows 10 users might find that Command Prompt is missing from Win + X menu , and instead, it shows Windows PowerShell. Windows PowerShell can do most things that Command Prompt does. Alternatively, you can also use Windows PowerShell to change drive letter in Windows 10.

Step 1. Press Windows + X , and choose Windows PowerShell (Admin) to run Windows PowerShell utility as administrator.

Step 2. Next type get-disk command and press Enter to list all available drives the computer detected.

Step 3. Then you can type the command: Get-Partition -DiskNumber 1 | Set-Partition -NewDriveLetter F , and press Enter to assign a new drive letter. You should change “*” with the actual disk number of target drive, and replace “F” with the new drive letter you’d like to assign to the drive.

MiniTool Partition Wizard – Professional Free Disk Partition Manager

Instead of using CMD or PowerShell to change drive letter for a drive in Windows 10, you can also utilize third-party free disk partition manager like MiniTool Partition Wizard to easily change drive letter and manage disk partitions on Windows 10.

MiniTool Partition Wizard let you easily create/delete/extend/resize/format/wipe partitions, convert partitions formats, migrate OS, clone disk, test hard drive speed , analyze hard drive space usage, check and fix disk errors , and more.

By following the detailed guides above, you can easily change drive letter with CMD (Command Prompt), PowerShell or MiniTool Partitioon Wizard on Windows 10.

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Change a drive letter from Command Prompt or batch script in Windows 8?

I have an external hard drive that I connect often to my computer. At some point it was assigned letter G: and based on that my other software works.

Nowadays, suddenly it gets letter F:

Is there any way I can use a batch script to change the letter from F: to G:. I don't mind running the batch script manually?

If so, what is the code I should use and will it need administrative permissions?

• command-line

• 1 See diskpart and yes you need admin. In theory it should have remembered the drive letter, consider changing it manually on disk management first. –  Bob Commented Jul 28, 2013 at 18:31
• @Bob: It could be that it only remembers drive letters after they have been assigned manually at least once. –  grawity_u1686 Commented Jul 28, 2013 at 19:57
• 1 Thanks! I have changed it a couple of times manually, but everytime it goes back to the old one. –  gontadu Commented Aug 6, 2013 at 14:42
• I have noticed that it was remembered when I had one device using a drive letter. When I started using multiple devices with the same drive letter, they get forgot, I have not verified the hypothesis, but I guess Windows 10 remembers the last device assigned to a drive letter. –  BtF Commented Aug 2, 2021 at 8:56

There are several methods:

mountvol – use it once to delete an existing letter, then again to assign a new one;

diskpart – interactive;

diskmgmt.msc aka Disk Management – a graphical tool.

Whichever you choose, assigning once should be enough, the assignment will be remembered afterwards.

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Find USB Drive letter

I need to get the drive letter of the usb pen drive.the command CHDIR >drive.txt gives me the drive letter L:.How do I read/get this info "L:" without quotes into a variable in my batch file

5 Answers 5

Here's how to get a USB drive letter from any drive.

• this is useful; but what if there is a (multi) card reader it will mention them too. –  M. A. Commented Mar 28, 2015 at 9:27

Whatever chdir outputs can also be used by the pseudo-variable %CD% . So you already have a variable with that information.

Otherwise you can use for :

But I think %CD% is much easier :-)

EDIT: You said that with the quotes already. You won't have any quotes in the variable unless you want them in there.

As for the trailing backslash: You can use the following instead of %CD% :

which will expand %CD% and remove the last character, which you know is the backslash.

Still, will only work if you're in the root directory of that drive. Otherwise you can also use

• %CD% is ok similar to chdir but I need to remove the backslash "\" the variable should only be "L:" without quotes –  Dario Dias Commented Apr 25, 2009 at 10:34

Using, in your batch, something like:

Would yeld a content of L: as you asked, if this is the current directory the script is in, at the point when you use it. If you have some popd/pushd, cd, etc.. within the batch, take care when you use it. The rest is up to you

Providing how you would use it (a part of your batch maybe) would have help alot to receive a better answer. We only can guess. The reason, I think, for the couple of for loops in answers. Might not be needed but we're guessing.

This i what i use to find the letter on my USB

• Just change the "NAME OF THE USB" to the name of the USB

Since cd will output something like:

you need to just grab the first field using "\" as the delimiter as follows:

This will set the environment variable curdrv to c: for the aforementioned output.

Don't forget to use the double-% (%%d) variant if running inside a cmd file.

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