Yes.
Yes, you can delete windows 7 by formatting your drive, but all of your files will be gone. If you have two hard drives, you can either copy your data from one drive to the other or put xp/vista on the second one and use the windows 7 drive as a slave.
Only two drives can be supported on an IDE cable. One Master and one Slave.
Only two drives can be supported on an IDE cable. One Master and one Slave.
Some IDE drives have a master/slave jumper, but a significant number of IDE drives defaulted to a "cable select" setting where the drive would determine for itself whether it was the master or the slave by which of the two sockets on the cable it was plugged into.
On the older style ATA drives, now called PATA or simply IDE, each drive chain had two positions for drives. One was called the Master, and the other the Slave drive. The drives performed in exactly the same manner, and the only difference most people would notice was that the Master drive was given a drive letter before the slave drive. In short, a Slave drive does everything a Master drive does.
Yes. Check out these two policy settings: User Configuration | Administrative Templates | Windows Components | Windows Explorer | Hide these specified drives in My Computer And User Configuration | Administrative Templates | Windows Components | Windows Explorer | Prevent access to drives from My Computer
Yes. There is a process called Dual Booting, but it requires two hard drives. Just search for "how to dual boot windows vista and windows XP?".
depends on the BIOS and the Hardirves. Some older IDE drives have a switch or a jumper on them that u can select Master or Slave. Some computer you can change this in the BIOS. Master being the controller and slave being the controlled
Check the motherboard. You can connect two drives to a single parallel cable. Most traditional motherboards have two IDE sockets and you can run a maximum of four drives. (one cable per socket, two drives per cable) but you need to configure the drives with jumpers as "primary" and "slave". Many of the newer motherboards have a "SATA" (Serial ATA) socket or some combination of SATA and IDE but you'd have to use a SATA drive with a SATA cable to use the SATA socket.
There is no requirement that one or the other is the Master or Slave, as long as one of them is (if they are on the same cable.)
I'm assuming your using Windows. You can see the drives by double clicking "My Computer" on your desktop. From there you can double click on the drives to see the contents. If you can't see the other drive, make sure its installed properly.