Presentation on theme: "Live CDs. What is a Live CD? Prerak Parikh What is a Live CD? CD or DVD containing bootable CD-ROM disk that loads and boots an OS Instead of using the."— Presentation transcript:
What is a Live CD? Prerak Parikh
What is a Live CD? CD or DVD containing bootable CD-ROM disk that loads and boots an OS Instead of using the hard drive to boot, the computer uses the Live CD
What is a Live CD? Can be made from many different Operating Systems Gives the ability to run a complete, modern Operating System
Some Examples ● Windows ● Ubuntu ● Debian ● Mac ● Solaris
Origins Jason Morrison
The Beginning The original concept Why CD's? What changed?
Live CD's Develop CD drives / burners expand Faster drives allow practicality The cause of the boom
First Releases Yggdrasil Linux (1992~1993) DemoLinus (1998) Change in development direction
How It Works Dan McFadden
How It Works - Insert CD into CD-ROM Drive - Automatically boots - Enter BIOS, change Boot Sequence
How It Works Since there is no reading from or writing to a hard drive, a RAM disk is created that simulates a hard drive.
How It Works Normal Setup Boot Strap / BIOSHard DriveOS in RAM OS Hard Drive I /O Boot Strap / BIOSLive CD OS in RAM OS RAM Disk I / O
RAM Disk - Orders of magnitude faster than interacting with a hard drive - Limits amount of memory, however
RAM Disk Digression: You can set up your own RAM Disk outside of Live CD's - Through kernel - Through user space applications
Uses Jon Sherman
The Obvious Test drive Use without installing Use as a normal computer
Security Allows use of an untrustworthy computer Prevents second owner from viewing windows event logs
Hardware Upgrades Installing new memory Testing new software version
Troubleshooting Decide if problem is caused by hardware or software System restore Data recovery
Performance Upgrades Run file system completely in RAM Improves performance Improves power efficiency
Disadvantages Sam Perlow
Software Disadvantages ● Installed programs forgotten each time ● Can't be updated ● Must be configured with each run ● Need prior programming experience to customize
Hardware Disadvantages ● Limited H/W compatibility ● Some older computer can't boot from CD ● Slow to boot
Advantages Nidhi Shah
No need to install anything on your computer As its name implies, the live CD runs live from the removable medium. You don’t need to install Linux to your hard disk. Just insert the medium into your computer and reboot to bypass your hard disk and run the CD.
You can test your computer Helps you check that your hardware is supported before committing to a Linux system. For example, you will know in advance if your printer, video card, network card, or other component will just work with your selected Linux system, or whether you might need to do some extra tweaking.
Doesn’t disrupt your installed computer system You can run the live system without touching the contents of your hard disk. The entire operating system is on the CD or DVD, and uses your computer’s RAM to hold temporary data.
Other Advantages A user with some programming experience can re- master the distribution as he sees fit. After making the changes, the resulting disk image is written to CD,which is reliable and convenient Live-CD as before, now filled with your choice of software. It is enough to recall such distributions as Linux LiveCD Router -- a Linux distribution designed to share a broadband connection over WiFi, Trustix.