Some versions of DOS do not assign the drive letter, beginning with C:, to the first active primary partition recognized upon the first physical hard disk, but on the first primary partition recognized of the first hard disk, even if it is not set active.If there is more than one extended partition in a partition table, only the logical drives in the first recognized extended partition type are processed. COM provide a preboot config structure, holding bit flags to select (beside others) between various drive letter assignment strategies.MS-DOS/PC DOS versions 4.0 and earlier assign letters to all of the floppy drives before considering hard drives, so a system with four floppy drives would call the first hard drive E:.Tags: Writing Skills Essay Penn FosterEssay On Science And Social ApplicationIowa Creative Writing Summer Program High SchoolMarketing In A Business PlanGood Ways To Start A College EssayHow To Prepare An AssignmentEthan Frome Isolation EssayFrank Schurr Dissertation
For example, if the last local drive is drive D: and a network drive would have been assigned as E:, then a newly attached USB mass storage device would also be assigned drive E: causing loss of connectivity with either the network share or the USB device.
Users with administrative privileges can assign drive letters manually to overcome this problem.
These strategies can be preselected by a user or OEM or be changed by a boot loader on the fly when launching DR-DOS.
Under these issues, the boot drive can be different from A: or C: as well.
MS-DOS on the Apricot PC assigns letters to hard drives, starting with A:, before considering floppy drives.
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A system with two of each drive would call the hard drives A: and B:, and the floppies C: and D:.This concept of multiple drive letters sharing a single physical device (optionally with different "views" of it) is not limited to the first floppy drive, but can be utilized for other drives as well by setting up additional block devices for them with the standard DOS DRIVER. This is often done to differentiate them from local drives: by using letters towards the end, it reduces the risk of an assignment conflict.It is especially true when the assignment is done automatically across a network (usually by a logon script).In most DOS systems, it is not possible to have more than 26 mounted drives.Atari GEMDOS supports 16 drive letters A: to P: only.Increasing microcomputer storage capacities led to their introduction, eventually followed by long filenames.In file systems lacking such naming mechanisms, drive letter assignment proved a useful, simple organizing principle.When there is no second physical floppy drive, drive B: can be used as a "virtual" floppy drive mapped onto the physical drive A:, whereby the user would be prompted to switch floppies every time a read or write was required to whichever was the least recently used of A: or B:.This allows for much of the functionality of two floppy drives on a computer that has only one. Network drives are often assigned letters towards the end of the alphabet.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).owes its origins to IBM's VM family of operating systems, dating back to CP/CMS in 1967 (and its research predecessor CP-40), by way of Digital Research's (DRI) CP/M.