High-density disk drives could handle both the new 1.44 MB format and the old 720K format, though there could be compatibility issues in reading 720K disks on low-density drives after they were written to with a high-density drive, even though the writing is done in an emulation of the old format, due to the different drive head on the newer drives. These disks were generally used with FAT12 file systems under the MS-DOS or PC-DOS operating system.
It had 80 tracks per side, with 18 sectors per track, and 512 bytes per sector.
The PC-DOS 1.44M format (3 1/2", double sided, high density) was the high-density counterpart of the PC-DOS 720K format for 3 1/2" floppy disks, storing twice as much data due to use of a different media surface capable of handling a higher density of data.
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