A designation for a letter drive on a computer, as in a hard drive, hard drive partition, CD-ROM drive, etc.
Generally, because A: is reserved for a 3 1/2 inch floppy drive, B: for the obsolete 5 1/4 floppy drive (the letter is skipped if the drive does not exist), and C: for the first hard drive, D: is most often a second hard drive or a first CD-ROM drive.
Letters thereafter, such as E:, F:, G:, etc. can be filled by CD-ROM drives, burners, external hard drives, USB drives, and the like as necessary. While not required to be in alphabetical order, it is this way by default.
"Now open up the MS-DOS prompt and type in 'D:'"
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