How to install a hidden operating system?

Much like what OEM vendors provide in their hidden partitions for OS recovery... How do I create a bootable operating system which is hidden from an existing Windows operating system on a computer?

What OEM consumer PC vendors seem to be doing for their recovery systems is listening for a keypress on boot and then booting the hidden partition if it receives the keypress or handing off to the proper Windows bootloader if it doesn't receive the keypress.

How can I replicate this with a real operating system instead of a recovery environment?

(FYI, Truecrypt's hidden operating system feature is NOT what I'm looking for, even though it's likely the first Google result you'll find)
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OrbixxAsked:
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IanThCommented:
the recovery partition is just made inactive usually

you can make a partion inactive and that means the os wouldn't see it and when the key is pressed during boot the code makes the bios see that partion as boot by changing its status flag to enabled and boot

so your problem is going to be as your not rewritting the bios how would you get your keypress and boot code into the bios
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Chris BRetiredCommented:
Sounds like you are looking for a dual boot boot loader?? PQBoot does this easily and reliably. Set one OS as default and the other as an option with a short time out. If you do nothing you get OS A, if you press the required key you get OS B. This is part of Partition Magic.

http://www.partitionmagic-guide.com/

Chris B
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Chris BRetiredCommented:
Oh and yes, you can totally hide the "other" OS from the active one, or allow file transfer between them.

Chris B
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OrbixxAuthor Commented:
So the partition magic basically deployed a custom alternative bootloader?
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Chris BRetiredCommented:
Correct. Same principle as HP for example press F something to enter recovery, which starts a ghost restore. It could start another OS just as well as DOS.

Chris B
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rindiCommented:
The problem is that partition magic is really old. It was built by powerquest which was bought by symantec many years ago, after which partition magic wasn't further improved. It surprises me that it is still officially available! It also isn't the official Symantec site, so that makes me a bit skeptical whether this is a serious site. You'll also notice that it says it supports large HD's up to 80GB size! Today's disks are much larger and I assume you'd have problems with today's HD's.

If you are going to try this via a bootmanager I suggest getting one from another manufacturer. Good is bootit-ng, and also acronis has one.

http://terabyteunlimited.com/
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OrbixxAuthor Commented:
Are there are free or open source alternatives?
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