CIS 225
Lecture 12: File System Management
Partition Styles
- Master Boot Record (MBR)
- Partition Table
- 4 primary partitions or
3 primary + 1 extended - BIOS for booting
- GUID Partition Table (GPT)
- Partition data within partitions
- Redundant backup tables
- EFI for booting
Bootloader
- BIOS
- Uses MBR disks for booting
- Master boot code in 1st sector
- EFI
- Uses GPT disks for booting
- ESP (EFI System Partition) & MSR (Microsoft Reserved) partition required
Basic vs. Dynamic
- Basic
- Drives correspond to partitions
- Cannot modify on the fly
- Dynamic
- Allows spanning & RAID
- Can modify on the fly (somewhat)
Windows Formats
- FAT/FAT32
- File Allocation Table
- FAT: <4GB; FAT32: <32GB
- Simple Access Controls
- NTFS
- New Technology File System
- File info stored as Database
- Advanced Access Controls
Linux Formats
- exFAT
- File Allocation Table
- Similar to Windows FAT32
- ext3/ext4
- Extended File System
- Up to 1 Exbibyte (~1018 bytes)
- Journals Protect Against Crashes
Windows Disk Management
Ubuntu
Permissions
- Determines which users can read/write files
- Based on user and group memberships
- Helps prevent unwanted access to files
Windows Permissions
Windows Permissions
- Full Control - Can take ownership & change permissions
- Modify - Read/Write/Change/Delete
- Read & Execute
- List Folder Contents - Folders Only
- Read - Access files
- Write - Modify files
Ubuntu Permissions
Ubuntu Permissions
- 3 classes: User, Group, Others
- 3 rights:
- Read - Can read contents
- Write - Can create/modify/delete
- Execute - Can run programs/scripts
Modifying Ubuntu Permissions
- chmod - Change permissions
- chmod [class][op][mode] file/folder
- chmod [octal_mode] filename/folder
- chown - Change User/Group (sudo)
- chown [user]:[group] filename/folder
- chgrp - Change Group (must own file)
- chgrp [group] filename/folder
Reading
- Windows 8 Book - Chapter 8
- Ubuntu Unleashed - Chapter 15
Assignments
- Lab 5 - User & File Management: Due 10/13 @ 11:30 AM