IBM 3390
1 Cyl = 15 tracks = 180 blocks = 849.960 bytes = 830 Kb
1 track = 12 blocks = 56.664 bytes = 55 Kb
1 block = 4.722 bytes = 4 Kb
2.226 Cilindros por volumen
1,892 MB por volumen.
IBM 3380
1 Cyl = 15 tracks = 180 blocks = 712.140 bytes = 695 Kb
1 track = 12 blocks = 47.476 bytes = 47 Kb
1 block = 3.956 bytes = 4 Kb
Tabla con nformación adicional:
http://www.sdisw.com/vm/dasd_capacity.html