The term 'portable disk' refers to portable memory for a
computer that is in the shape of a disk, such as a CD, DVD, or
floppy disk. (On a floppy disk the disk part is on the inside)
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When prompted to format the floppy disk, click NO. Especially if
the disk has files that you wish to access. Formatting the disk
erases EVERYTHING on the disk and starts the disk anew.