What Microsoft Says About Dual Booting in Windows 8
As far as Microsoft is concerned, the Unified Extensible Firmware Interface (UEFI) mode and Secure Boot are vital to making Windows 8 secure (the term they use is “critically important").
BitLocker and Seamless Boot will apparently rely on the UEFI, and at a recent BUILD session (an online seminar for developers hosted via the Microsoft Developer Network) it seems that UEFI will be a key aspect of managing the operating system and computer:
All firmware and software in the boot process must be signed by a trusted Certificate Authority (CA)
Required for Windows 8 client
Does not require a Trusted Platform Module (TPM)
Reduces the likelihood of bootkits, rootkits and ransomware
“For the enthusiast who wants to run older operating systems, the option (disabling secure boot) is there to allow you to make that decision," said Microsoft in a recent blog post on the matter, which went on to indicate that dual booting is up to the end user – but some loss of security would be the result of this.
For users wishing to install multiple operating systems on their hard drive and add a boot menu, then Windows 8 will be open to specific types of attack. Which suddenly makes dual booting less attractive.