Cylinders A cylinder is a set of matched tracks. The concept is not particularly useful for floppies. If you put these all together on top of each other, you'd have something that looks like a tin can with no top or bottom - a cylinder. The computer keeps track of what it has put where on a disk by remembering the addresses of all the sectors used, which would mean remembering some combination of the cylinder, track, and sector. The cylinder method writes data down the disks on the same cylinder.
All data is erased .
Surfaces are checked for physical and magnetic defects. A root directory is created to list where things are on the disk.