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Regarding to the solution there:

I have a system with three partitions. One runs windows 7, one runs windows XP and is for some experimental programming and testing. I don't want to mess up anything, so I am going to disable the windows 7 partition like described on the linked page above from windows XP to protect the operating system.

When I do this, is the windows 7 partition only disabled for the running XP os, or is the windows 7 partition rendered unbootable?

with best regards

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up vote 1 down vote accepted

If you use grub you can add hide/unhide entries to /boot/grub/menu.lst. It can temporally change partition type so OS can see it but it is unknown type so you cant access any files.

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