USB Drive Letter Manager

Martin Brinkmann
Sep 5, 2008
Software, Windows

USB Drive Letter Manager is a software that can manage removable devices such as USB hard drives, flash drives or card readers that are connected to a computer. The software runs on any 32-bit and 64-bit Windows NT operating system since Windows 2000 including Windows Vista.

The USB Drive Letter Manager runs as a Windows service that solves the problem of drive letter assignments between usb devices, subst folders and network shares by automatically checking if the drive letter has been assigned to the latter before assigning a drive letter to a new USB device.

The software program can reserve letters so that they are not used by local drives, assign letters only from a list of default drive letters and specifically assign drive letters to USB devices by placing an ini file in the device's root directory.

Another interesting feature of USB Drive Letter Manager is the ability to remove drive letters of card reader slots as long as no card is inserted. If you ever connected a multi-slot card reader to Windows you might have noticed that each slots receives its own drive letter by default which can be a lot depending on the number of different card slots on the reader.

By default USB Drive Letter Manager is only making sure that no network shares or subst folder letters get assigned to a newly connected USB device. Everything else is handled by the USBDLM.INI file. Additional parameters are described on the homepage of the software.


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  1. [email protected] said on September 15, 2009 at 12:26 pm


  2. garbanzo said on September 5, 2008 at 2:24 pm

    wow, i’ll try this out as soon as i get home. and if it works, then you just made my day, Martin!

    i have a lot of shortcuts to portable apps on external drives, so when something happens and those drive letters change, it is very frustrating. it’s easy enough to fix, but it sounds like this might prevent it altogether.

    and if it keeps my card reader from adding a hundred drives when i plug it in, then it gets another point.

    another excellent post!

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