DefragThe defrag command is used to defragment a drive you specify. The defrag command is the command line version of Microsoft's Disk Defragmenter.
DelThe del command is used to delete one or more files. The del command is the same as the erase command.
The diantz command is used to losslessly compress one or more files. The diantz command is sometimes called Cabinet Maker.
The diantz command is the same as the makecab command.
DirThe dir command is used to display a list of files and folders contained inside the folder that you are currently working in. The dir command also displays other important information like the hard drive's serial number, the total number of files listed, their combined size, the total amount of free space left on the drive, and more.
DiskcompThe diskcomp command is used to compare the contents of two floppy disks.
DiskcopyThe diskcopy command is used to copy the entire contents of one floppy disk to another.
DiskpartThe diskpart command is used to create, manage, and delete hard drive partitions.
DiskperfThe diskperf command is used to manage disk performance counters remotely.
DiskraidThe diskraid command starts the DiskRAID tool which is used to manage and configure RAID arrays.
DispdiagThe dispdiag command is used to output a log of information about the display system.