So it stands to reason that the same format of a double-sided double density 5.25” disk would be 4x that capacity, or 1.44MB (1,440KB), right? But it wasn’t - it was 1.2MB.Įven more curiously, a standard MS-DOS format of a double-sided double density 3.5” disk WAS 1.44MB. So I was just chatting with a friend about the floppy disks we used back in the day (well, I was using single-sided single density 5.25” disks until the very end of 1994, but that’s neither here nor there), and I realized I had a question about “double density” and capacity.Ī standard MS-DOS format of a single-sided single density 5.25” disk was 360KB. Why? And is there a correlation/reason that the capacity of a formatted double-sided double density 3.5” disk happened to be exactly 4x that of a single-sided single-density 5.25” disk? TL DR: A standard MS-DOS format of a double-sided, double density 5.25” floppy yielded less than 4x the capacity of a standard MS-DOS format of a single-sided, single density 5.25” floppy.
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