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The difference in capacity vs. usable space on an 3.5 inch floppy disk is related to the FAT - file allocation table. This is an area that is reserved for machine and directory instructions.

To explain what this means is that most disks are referred to their unformatted size.

If you then create a 'protocol' format on the disk to support a particular operating system then this uses some of the space on the disk to do its housekeeping in. Therefore there will be a discrepency between the unformatted size and the formatted size.

The same is true of hard drives which are quoted in their unformatted size, which is then reduced after formatting. The amount of space loss is congruent with the size of the disk. The larger the disk the more space is used to store the format.

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Q: The calculated capacity of a floppy disk is 1.47mb to hold down data while the capacity is 1.44mbthe difference is 0.03 mb explain that?
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