Transcript Multibooting and Data Encryption under Windows XP – Ubuntu

Multiboot System under Windows XP –
Ubuntu – Windows 7
Qiong LIN - 28 April 2012
Multiboot
Mutlibooting means to
host multiple Operating
Systems (OS) on one
single computer
Why Multibooting ?
Some softwares run only under one
specific operating system (ex: Windows or
Linux)
 Tests running on different environments
within one machine
 Efficiency and cost savings on hardware
 Migration to a new operating system

Step into …
Multibooting Process
Preparation beforehand: partitioning
 Installing new operating systems
 Select and launch one of those operating
systems

Step 1 - Partitioning
Partitioning is the process of dividing an
entire storage device into smaller chunks
Rules to keep in mind:
 Size & structure
 File system specific to OS’s in use
Partitioning – Size and Structure
Size

Allocate sufficient space depending on new OS and
future uses
Structure of the partition:

Primary partition ( max 4 units)

Extended partition (> 4 units), which leads to:

Logical volume
How to partition ?

Issue: computer hard drive mounted -> not
modifiable

Solution: use a Live CD (System Rescue
CD)
Partitioning – File systems
Assign the right file system to each partition:

NTFS -> Windows file system

ext4 -> Linux file system
Step 2 – Installation ongoing …
Three OS’s are installed in this order:



Windows XP
Ubuntu
Windows 7
…. Installations done!
Step 3 – Multibooting process




BIOS -> sends INT 13h -> 1st sector (MBR)
Customised GRUB multiboot start menu
Load the booting code
Launch the operating system on the selected
partition
1st
Data Protection
Achieve data security => data encryption
No separation between different
OS’s – free access to data
Linux
Win XP
(ext2Fsd)
Linux
Win 7
(ext2Fsd)
Win XP
Win 7
Data Encryption – two scenarios
OS built-in password protected encryption
 Linux – pre-installing protection (option on the
whole partition/individual files)

Windows XP/7 – individual files
Third-party encryption (TrueCrypt)
 Virtual mounted disk
Example: File locally encrypted on Linux
Linux
John
Windows
John
Encrypted file
permission denied
Maria
Conclusions
Multibooting -> gain flexibility on number of
OS’s available
 To better explore the computer capacities
 Skills gained: booting, partitioning, OS’s
features, different file systems
 Becoming conscious about data
safeguarding
