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Lecture Notes on Operating Systems 2 Jelena Mamčenko Operating Systems 23.3 Erasing Files

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Lecture Notes on Operating Systems 2 Jelena Mamčenko Operating Systems 23.3 Erasing Files Vilnius Gediminas Technical University Jelena Mamčenko Lecture Notes On OPERATING SYSTEMS Code FMITB01001 Course title Operating Systems Course volume 4,0 cr. (6,00 ECTS cr.) Teaching methods (Full-time, daytime studies): Lectures - 32 h per semestre Laboratory works - 32 h per semestre Individual work - 96 h per semestre Assesment - Examination Course aim: Understandig of Operating System's functions. Course description: Concept of operating system. Control the activities and resourses of computer. Interpreting comands. Coordinating activities. Operating systems MS-DOS, OS/2, UNIX. Networking. Jelena Mamčenko Operating Systems CONTENT 1 Introduction ............................................................................................................................................ 5 2 History of Operating Systems ................................................................................................................ 6 3 A history of personal computers ............................................................................................................ 8 4 Configuration........................................................................................................................................ 10 5 Display.................................................................................................................................................. 11 6 Motherboard ......................................................................................................................................... 11 7 Central processing unit ......................................................................................................................... 11 8 Primary storage..................................................................................................................................... 12 8.1 Technology and history ................................................................................................................ 13 9 Expansion card ..................................................................................................................................... 13 9.1 History of the expansion card ....................................................................................................... 13 10 Power supply .................................................................................................................................... 14 11 Computer power supply ................................................................................................................... 15 11.1 Domestic mains adaptors.............................................................................................................. 16 11.2 Linear power supply ..................................................................................................................... 16 11.3 Switched-mode power supply ...................................................................................................... 16 12 Optical disc ....................................................................................................................................... 17 12.1 First-generation optical discs........................................................................................................ 17 12.2 Second-generation optical discs ................................................................................................... 17 12.3 Third-generation optical discs ...................................................................................................... 18 13 Secondary storage............................................................................................................................. 18 14 Computer keyboard .......................................................................................................................... 18 15 Mouse (computing) .......................................................................................................................... 19 16 Main memory ................................................................................................................................... 20 17 Hard disk drive ................................................................................................................................. 20 18 Graphics - Video card....................................................................................................................... 20 19 Disk operating system ...................................................................................................................... 21 19.1 History of DOS ............................................................................................................................. 21 20 Examples of disk operating systems that were extensions to the OS ............................................... 22 21 Examples of Disk Operating Systems that were the OS itself ......................................................... 22 22 Input/Output System......................................................................................................................... 23 23 Command Syntax ............................................................................................................................. 25 23.1 Checking the Disk ........................................................................................................................ 28 23.2 Backing Up a Floppy Disk ........................................................................................................... 28 Lecture Notes on Operating Systems 2 Jelena Mamčenko Operating Systems 23.3 Erasing Files ................................................................................................................................. 29 23.4 Renaming Files ............................................................................................................................. 29 23.5 Copying Files ............................................................................................................................... 29 24 Subdirectory Introduction................................................................................................................. 31 25 Subdirectory Review ........................................................................................................................ 34 26 BATCH FILES ................................................................................................................................. 34 26.1 AUTOEXEC.BAT ....................................................................................................................... 41 27 Data structure in disk. ....................................................................................................................... 45 27.1 Disk Structure and Partitions ........................................................................................................ 45 27.2 Disk tracks, cylinders, and sectors ............................................................................................... 45 27.3 Cylinder group .............................................................................................................................. 46 27.4 Physical disk structure .................................................................................................................. 46 28 File systems ...................................................................................................................................... 47 29 FAT12 .............................................................................................................................................. 51 30 Initial FAT16 .................................................................................................................................... 51 30.1 Final FAT16 ................................................................................................................................. 52 30.2 Long File Names (VFAT, LFNs) ................................................................................................. 52 30.3 FAT32 .......................................................................................................................................... 52 30.4 FAT and Alternate Data Streams ................................................................................................. 53 30.5 Main disk structures ..................................................................................................................... 54 31 File Allocation Table ........................................................................................................................ 56 32 Floppy disk ....................................................................................................................................... 57 33 AUTOEXEC.BAT ........................................................................................................................... 58 34 CONFIG.SYS ................................................................................................................................... 58 34.1 Example CONFIG.SYS file for DOS .......................................................................................... 59 35 Computer software ........................................................................................................................... 59 35.1 Relationship to hardware .............................................................................................................
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