Dual magnetic head and method for writing on very high track density and conventional track density floppy disk.

摘要

A dual magnetic head (10) having a first magnetic core (30) for reading and writing very high track density floppy disks and a second magnetic core (34) for reading and writing conventional track density floppy disks. Neither the first nor the second magnetic cores require the trim erase elements associated with prior art magnetic cores for use with floppy disks. When writing on conventional track density floppy disks, separation between data tracks is achieved by erasing a circular region (142) on a first rotation of the floppy disk, erasing a second region (143), separated from the first region by a small gap, on a second rotation of the floppy disk, and writing data during a third rotation of the floppy disk centered about the small gap. With very high density floppy disks, data is written directly between (50) optical servo tracks (48) on the floppy disk without use of the two erase steps.