You must format it.
Format a:
I think you can only use a windowsbootable floppy disc for the system in which it was made from.
In order to use a floppy disc you need to have a floppy disc drive.These days most computers don't have them at all, as they are so old floppy discs are hard to find..and the maximum capacity of a floppy disc is only 1.44Mb. I recently tried to buy some , but I couldn't find any at 15 different computer shops
For putting a floppy disc in. Floppy discs were used a lot in the 1970's as CD's were not invented until the 1980's
A floppy disc use a magnetic pattern to store data, and loudspeakers are usually based around a (strong) magnet. The magnet can upset the magnetic pattern, making the data unreadable.
After you make the floppy disc a boot drive (beforehand), you can use it to boot your system when you are unable to boot using your harddrive.
Most modern sophisticated software is to big to fit on a single floppy disc/diskette.It is simpler to burn a single CD than to create multiple diskettes. package and distribute them.Most modern computers do not have the ability to read a floppy disc.
Before use it..
The best current way to proceed about this would be to just get a new floppy, as a broken is impossible to "fix" as floppy disks are way outdated now, because most people use flashdrives and CD-RW disc.
Low capacity; only 1.4 MB. Slow data transfer speed Can not use long time, ie. they become corrupt unexpectedly. Most new computers do not have a floppy drive.
Cds, floppy discs, or paper.
the disadvantage is you cannot hold as much memory on a floppy as a CD or if your into music,gaming,etc.. then you defiently wanna use CD has more space can hold bigger more graphic files then any floppy could that's my opinion on the situation but Floppys don't break easily you don't have to worry about them getting scratched
The answer is probably "You don't". Macs have not supported 3.5 inch floppy discs for many years. If you need to use such a disc with a modern Mac then you will need to buy an external USB floppy disc drive. If you mean a 3 inch mini DVD then again you will need some form of external drive to use such a disc or an old Mac with a pop out drawer to hold the disc. If it is a disc from a camera then you can usually connect the camera to the Mac and read the disc from the camera. Full details of the type of disc and Mac would help.