Disk operating system

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DISK OPERATING SYSTEM

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Disk operating system

  1. 1. Submitted by- Hasnahana Chetia M.Sc Ist semester, Deptt. Of Biotechnology
  2. 2. What is DOS??? DOS stands for Disk operating system. It is used for abstraction and management of secondary storage devices of the computers and the information stored there.
  3. 3. HISTORY In early days of computers, there were no disk drives; instead magnetic tapes, punched cards etc. were used. After creation of hard disks and floppy disks, the need of a software for managing rapid access to block storage of sequential and other data became inevitable. So, DOS was developed.
  4. 4. FUNCTIONS To manage disk files. To allocate system resources according to the requirement. To provide features essential to control hardware devices such as Keyboard, Screen, Disk Devices, Printers, Modems and programs.
  5. 5. EXAMPLES OF DISK OPERATING SYSTEMS DOS/360 for IBM system/360 family of Mainframe computers. DOS for DEC PDP-II Minicomputers. The best known family of operating systems named DOS was that running on IBM PC’s type hardware using the INTEL CPU’s or alike. The original was 86-DOS, which later became MS-DOS when Microsoft bought the license and rights.
  6. 6. NAMING THE FILES IN DOS DOS permits the user to assign a name consisting of two parts to a filename - primary & secondary names. Primary can consist of 8 characters while secondary can consist of 3 characters. Both names are separated by a dot (.) For eg; Bioedit.exe
  7. 7. DIRECTORY STRUCTURE IN DOS DOS files are organized in a hierarchical or inverted tree-like structure. The general analogy is with a file cabinet having a no. of drawers, which in turn may contain folders that may contain info. The file cabinet in DOS is the ROOT DIRECTORY, the drawer is INDIVIDUAL DIRECTORY, the folders are SUB-DIRECTORY and the info contained in these files may be termed as FILES.
  8. 8. COMMANDS IN DOS 1.cd-command used to switch directories. 2.dir-allows you to see the available files in the current and/or parent directories. 3.copy-allows the user to copy one or more files to an alternate location. 4.del- command used to delete files from the computer. 5.edit-allows a user to view, create, and/or modify their computer files. 6.move-Allows you to move files or directories from one folder to another, or from one drive to another. 7.ren (rename)-Used to rename files and directories from the original name to a new name. 8.deltree-Short for delete tree, deltree is a command used to delete files and directories permanently from the computer. 9.cls-Cls is a command that allows a user to clear the complete contents of the screen and leave only a prompt. 10.format-Format is used to erase all of the information off of a computer diskette or fixed drive.
  9. 9. THANK YOU

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