1. Open Computer Management (Local).
   
   
2. In the console tree, click Computer Management (Local), click Storage, and then click Disk Management.
   
   
3. Right-click a partition, logical drive, or volume, and then click Change Drive Letter and Paths.
   
   
4. Do one of the following:
   
   
   • To assign a drive letter, click Add, click the drive letter you want to use, and then click OK.
     
     
   • To modify a drive letter, click it, click Change, click the drive letter you want to use, and then click OK.
     
     
   • To remove a drive letter, click it, and then click Remove.
     
     

Important

• Be careful when making drive-letter assignments because many MS-DOS and Windows programs make references to a specific drive letter. For example, the path environment variable shows specific drive letters in conjunction with program names.
  
  

Notes

• To perform this procedure on a local computer, you must be a member of the Backup Operators group or Administrators group on the local computer, or you must have been delegated the appropriate authority. To perform this procedure remotely, you must be a member of the Backup Operators group or Administrators group on the remote computer. If the computer is joined to a domain, members of the Domain Admins group might be able to perform this procedure. As a security best practice, consider using Run as to perform this procedure. For more information, see Default local groups, Default groups, and Using Run as.
  
  
• To open Computer Management, click Start, click Control Panel, double-click Administrative Tools, and then double-click Computer Management.
  
  
• A computer can use up to 26 drive letters. Drive letters A and B are typically reserved for a floppy disk drives. If the computer does not have a floppy disk drive, you can assign drive letters A and B to removable drives, hard disk drives, or mapped network drives. Hard disk drives are typically assigned drive letters C through Z, while mapped network drives are assigned drive letters in reverse order (Z through C).
  
  
• You cannot change the drive letter of the system volume or boot volume.
  
  
• An error message may appear when you attempt to assign a letter to a volume, CD-ROM drive, or other removable media device, possibly because it is in use by a program in the system. If this happens, close the program accessing the volume or drive, and then click the Change Drive Letter and Paths command again.
  
  
• You can also mount a local drive at an empty folder on an NTFS volume using a drive path instead of a drive letter. For more information, see Related Topics.
  
  

1. Open Command Prompt.
   
   
2. Type:
   
   diskpart
   
   
3. At the DISKPART prompt, type:
   
   list volume
   
   Make note of the number of the simple volume whose drive letter you want to assign, change, or remove.
   
   
4. At the DISKPART prompt, type:
   
   select volume n
   
   Select the volume, where n is the volume's number, whose drive letter you want to assign, change, or remove.
   
   
5. At the DISKPART prompt, type one of the following:
   
   
   • assign letter=L
     
     Where L is the drive letter you want to assign or change.
     
     
   • remove letter=L
     
     Where L is the drive letter you want to remove.
     
     

Notes

• To perform this procedure on a local computer, you must be a member of the Backup Operators group, Administrators group, or you must have been delegated the appropriate authority. If the computer is joined to a domain, members of the Domain Admins group might be able to perform this procedure. As a security best practice, consider using Run as to perform this procedure. For more information, see Default local groups, Default groups, and Using Run as.
  
  
• To open a command prompt, click Start, point to All programs, point to Accessories, and then click Command prompt.
  
  
• A computer can use up to 26 drive letters. Drive letters A and B are typically reserved for a floppy disk drives. If the computer does not have a floppy disk drive, you can assign drive letters A and B to removable drives, hard disk drives, or mapped network drives. Hard disk drives are typically assigned drive letters C through Z, while mapped network drives are assigned drive letters in reverse order (Z through C).
  
  
• You cannot change the drive letter of the system volume or boot volume.
  
  
• An error message may appear when you attempt to assign a letter to a volume, CD-ROM drive, or other removable media device, possibly because it is in use by a program in the system. If this happens, close the program accessing the volume or drive, and then click the Change Drive Letter and Paths command again.
  
  
• You can also mount a local drive at an empty folder on an NTFS volume using a drive path instead of a drive letter. For more information, see Related Topics.
  
  
• For more information about DiskPart, see Related Topics.