Floppy Disk Formatting

[DJN92546 at aol.com]

We have received a file on a floppy disk from a client.  When we put it into 
the drive it says that disk has not been formatted.  We  already read from the 
disk and transferred the file to another system earlier.  Why, after we have 
already used the file on the floppy disk does it now tell us it is not 
formatted.  We need to open the file to print out some information from the original 
information on the disk.  We do get a question that asks if we want to format 
the disk now.  Can we say Yes to that?  Or should we say No?  If we say yes, 
what will it do to the disk?
Any help you can give, would be appreciated.  We do not want to lose any info 
on the disk so we are waiting for your answer.  Thank you.     
djn92546 at aol.com