Drive letter assignment is the process of assigning alphabetical identifiers to physical or logical disk drives or partitions (drive volumes) in the root filesystem namespace; this usage is now mostly found in Microsoft operating systems. Unlike the concept of UNIX mount points, where volumes are named and located arbitrarily in a single hierarchical namespace, drive letter assignment allows multiple highest-level namespaces. Drive letter assignment is thus a process of using letters to name the roots of the "forest" representing the file system; each volume holds an independent "tree" (or, for non-hierarchical file systems, an independent list of files).
Read more about Drive Letter Assignment: Origin, Operating Systems That Use Drive Letter Assignment, Order of Assignment, Common Assignments, ASSIGN, JOIN and SUBST in DOS and Windows
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