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Assign the drive letter A: to the first floppy disk drive (drive 0), and B: to the second floppy disk drive (drive 1). If only one physical floppy is present, drive B: will be assigned to a phantom floppy drive mapped to the same physical drive and dynamically assigned to either A: or B: for easier floppy file operations.
The Windows SUBST command is available in supported versions of the command line interpreter cmd.exe. [7] In Windows NT , SUBST uses DefineDosDevice() to create the disk mappings. The JOIN command is the "opposite" of SUBST , because JOIN will take a drive letter and make it appear as a directory.
Drive: This command-line argument specifies the drive letter of the disk for which to display the volume label and serial number. Note: On Windows, the volume serial number is displayed only for disks formatted with MS-DOS version 4.0 or later. OS/2 allows the user to specify more than one drive. The vol command displays the volume labels ...
The command was originally designed to label floppy disks as a reminder of which one is in the machine. However, it can also be applied to other types of drive such as mapped drives. [5] It is available in MS-DOS versions 3.1 and later and IBM PC DOS releases 3 and later. [6] It is an external command.
More than one drive letter can refer to a single volume, as when using the SUBST command. Warning: removing drive letters or mount-points for a drive may break some programs, as some files may not be accessible under the known path. For example, if a program is installed at "D:\Program Files\Some Program", it may expect to find its data files ...
The command prompt requires the use of drive letters to assign a working directory, which makes running complex batch files stored on a server UNC share more difficult. While a batch file can be run from a UNC file path, the working directory default is C:\Windows\System32\ .
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dd is a command-line utility for Unix, Plan 9, Inferno, and Unix-like operating systems and beyond, the primary purpose of which is to convert and copy files. [1] On Unix, device drivers for hardware (such as hard disk drives) and special device files (such as /dev/zero and /dev/random) appear in the file system just like normal files; dd can also read and/or write from/to these files ...