USB Drive Letter Manager (USBDLM) is a utility for Windows aimed at the advanced management of drive letters assigned to removable devices and internal volumes. It operates as a background service and allows you to set automatic rules for the assignment, change, or fixation of drive letters when connecting flash drives, external disks, memory cards, network drives, or specific partitions.
The software enables the association of permanent letters to devices identified by volume, serial number, media type, or mount point, preventing conflicts and unwanted changes when new devices are connected. You can create exceptions, reserve ranges of letters, prevent the use of certain letters, and enforce alternate paths, such as mount points in NTFS folders.
USB Drive Letter Manager also supports scripts and automatic actions upon the connection or disconnection of devices, allowing you to execute commands, start applications, or apply custom policies. It logs events, facilitates diagnostics, and can be configured through text files, without the need for graphical components.
The utility is widely used in corporate environments, servers, laboratories, and workstations that require standardization and predictability in the use of removable drives, functioning stably on both modern and older versions of Windows.