Twists are only in the floppy cables mate to help identify the hardware.
The newer 80core cables have a small nick in them instead.
The older 40core cables are best used for Optical drives
Yes you can install o/s on another drive. When the system boots up it will look and see two operating systems and give you the choice if I remember correctly.
BIOS must be set to allow other boot devices though I think. Not sure I dont use it!
i was also wondering whether these twists in ide cables is dangerous or not?
the only way i could avoid the twist was to put the Harddrives MIGHTLY close to each other with a 1cm gap between them
that seemed a little dangerous
what shall i do?