its either a re-writable disk or its not!
Yes.
A floppy disk DRIVE can read, erase and save information on a floppy disk. The disk can't do it by himself.
well, it depends on what kind of softwear you had to burn your cd.
Yes, of course!
Yes - that's basically what a hard disk is for. Perhaps I'm missing your question - can you rephrase it?
Formatting your hard disk for the PS3 will erase everything on it. If you are adding a hard disk to your PS3 it will prepare the drive for the system.
go to disk utility and you have the option to erase there
Go onto "My Computer" right click on the disk, and then select "Format" it will not entirely erase all the data on the CD, but it will erase majority of it.
You can't erase data from a DVD, so there's no option to do so.
This disk will certainly have to be reformatted and irreparable damage may have been caused. It is not advisable to do this.
keep away from magnets !