What are Unit Letters

With so many physical and logical partition volumes on a computer, the need for a drive identification system becomes apparent. Microsoft uses a drive letter system to identify these partitions. History
The operating system known as CP/CMS created the first letters of the disk, called filemodes. The microcompter CP/M operating system later adopted a similar method, using drive letters to refer to legacy physical storage. Microsoft then used the CP /M drive letter format for MS-DOS, OS/2, and Microsoft Windows. Microsoft drive letters can refer to physical and logical volumes.
A & B
drive letter A originally referred to a computer’s first floppy drive, while drive letter B referred to the second floppy drive. As floppy drives become less common, users assign drives A and B to removable drives, hard drive partitions or mapped network drives.
Ç
drive letter C usually refers to the first active partition of the computer’s hard drive. Some computers use drive C as another floppy disk drive, while others use drive C as a later hard drive partition
D – . letters Z
drive D to Z often refer to non-primary hard disk partitions, additional floppy drives, optical disk drives, and removable storage drives.

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