INT 1010 04-3.pdf
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INT 1010 04-3 Introduction to Information Technology Information Systems Software File Systems
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INT 1010 04-3.pdf
- 1. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) Introduction to Information Technology INT-1010 Prof C Luis R Castellanos 1 04.3 Information Systems: Software (File Systems)
- 2. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 2 Operating Systems Computer Software File Systems Downloading Files File Management
- 3. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 3 File Systems Information Systems Software
- 4. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 4 When a process completes (or crashes), any data stored in the main memory is lost. But data stored on a hard disk drive (HDD) or solid-state drive (SSD) is “persistent;” that is, it survives after the process completes, even if the computer shuts down.
- 5. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 5 Hard disk drives are complicated. Data is stored in blocks, which are laid out in sectors, which make up tracks, which are arranged in concentric circles on platters. Solid-state drives are simpler in one sense because blocks are numbered sequentially, but they raise a different complication: each block can be written a limited number of times before it becomes unreliable.
- 6. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 6 As a programmer, you don’t want to deal with these complications. What you want is an appropriate abstraction of persistent storage hardware. The most common abstraction is called a “file system.” Abstractly: • A “file system” is a mapping from each file’s name to its contents. If you think of the names as keys, and the contents as values, a file system is a kind of key- value database • A “file” is a sequence of bytes.
- 7. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 7
- 8. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 8 Documents PGCC 2024 SP 2024 FA INT1010 MAT1010 INT1111 MAT1111
- 9. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 14 Most used File Systems: FAT NTFS exFAT ext2, ext3 and ext4 XFS, JFS, and btrfs HFS+ APFS FAT32 ext3 ext4
- 10. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) 15
- 11. Introduction to Information Technology 4.3. Information Systems: Software (File Systems)
- 12. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) Textbook 17 https://eng.libretexts.org/Courses/Prince_ Georges_Community_College/INT_1010% 3A_Concepts_in_Computing Purchase of a book is not required.
- 13. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) Professor C 18 castellr@pgcc.edu eLearning Expert BS in Systems Engineering MS in Systems Engineering HC Dr in Education IT Professor | Spanish Interpreter | Spanish Instructor LCINT1010.wordpress.com Presentation created in 01/2022. Slides last updated on 10/2022
- 14. Introduction to Information Technology 4.3. Information Systems: Software (File Systems) Introduction to Information Technology INT-1010 Prof C Luis R Castellanos 19 04.3 Information Systems: Software (File Systems)