spanning
binding
RAID
Disk Spanning (raid 0)
RAID. There are different levels of RAID that have different features and can require even more than 2 drives to act as one drive.
Yes. In Windows 7 you can add up to 32 drives in a single spanned volume. The disks must be dynamic disks and can not be basic disks. However if one of the drives in the spanned volume fails then the entire volume will fail and the data will be lost.
Yes.
basic
harddrives
At the worst both drives will get selected at the same time and trash each other's data.
Yes. It needs to be the same type (MFM, PATA, SATA) as the original and properly configured. It is usually a very simple process.
2
Single drive