90 mm ISO

Of the different DBEM formats, 90 mm (3.5 in) ISO was probably the most widely adopted in the consumer market. It did not see much use in Western countries, while it became relatively popular in some Asian markets (such as Japan). Cartridges have similar dimensions to a 3-1/2 in floppy disk, but they are about twice the thickness. Capacities ranged from 128 MB to 2.3 GB across generations, and drives from the later generations were typically backward-compatible with earlier media. Both rewritable and WORM variants were produced.