How many kilobytes of data can a diskette store?

A standard 3.5-inch floppy diskette can store 1.44 megabytes of data, which is equivalent to 1,440 kilobytes. Older 5.25-inch floppy diskettes had varying capacities, typically 360 kilobytes or 1.2 megabytes. The actual storage can vary based on the formatting and type of diskette used.