File Management and Security

Study Notes

File Operations:
- Create: creating a new file
- Read: accessing and viewing file contents
- Update: modifying file contents
- Delete: removing a file
File Attributes:
- Permissions: access control for reading, writing, and executing
- Ownership: user and group ownership
- Timestamps: creation, modification, and access times

Access Control:
- User-based access control: controlling access based on user identity
- Role-based access control: controlling access based on user role
Encryption:
- Symmetric encryption: using the same key for encryption and decryption
- Asymmetric encryption: using a pair of keys (public and private)
File Permissions:
- Read (r): allowing read access
- Write (w): allowing write access
- Execute (x): allowing execution

File Extensions:
- Identifying file types (e.g., .txt, .jpg, .exe)
- File associations: linking file extensions to applications
File Formats:
- Text files: plain text, ASCII, Unicode
- Image files: raster (e.g., JPEG, PNG) and vector (e.g., SVG)
- Binary files: executable files, data files

File System Types:
- Local file systems: storing files on local devices
- Network file systems: storing files on remote devices
- Distributed file systems: storing files across multiple devices
File Organization:
- Directory structure: organizing files into folders and subfolders
- File naming conventions: naming files with meaningful names

Storage Devices:
- Hard disk drives (HDD): magnetic storage
- Solid-state drives (SSD): flash storage
- Optical storage: CDs, DVDs, Blu-ray discs
Storage Capacity:
- Measuring storage capacity: bytes, kilobytes, megabytes, etc.
- Storage density: increasing storage capacity per unit area

File Operations:
- Creating a new file is known as the "create" operation.
- "Read" operation allows accessing and viewing file contents.
- "Update" operation modifies file contents.
- "Delete" operation removes a file.

Access Control:
- User-based access control grants access based on user identity.
- Role-based access control grants access based on user role.
Encryption Methods:
- Symmetric encryption uses the same key for encryption and decryption.
- Asymmetric encryption uses a pair of keys (public and private).
File Permissions:
- "Read" permission (r) allows read access.
- "Write" permission (w) allows write access.
- "Execute" permission (x) allows execution.

File Extensions:
- File extensions identify file types (e.g., .txt, .jpg, .exe).
- File associations link file extensions to applications.
File Formats:
- Text files contain plain text, ASCII, or Unicode.
- Image files can be raster (e.g., JPEG, PNG) or vector (e.g., SVG).
- Binary files can be executable files or data files.

File System Types:
- Local file systems store files on local devices.
- Network file systems store files on remote devices.
- Distributed file systems store files across multiple devices.
File Organization:
- Directory structure organizes files into folders and subfolders.
- File naming conventions use meaningful names.

Storage Devices:
- Hard disk drives (HDD) use magnetic storage.
- Solid-state drives (SSD) use flash storage.
- Optical storage devices include CDs, DVDs, and Blu-ray discs.
Storage Capacity:
- Storage capacity is measured in bytes, kilobytes, megabytes, etc.
- Storage density increases storage capacity per unit area.