Post by frankie on Aug 31, 2011 22:04:50 GMT
Taping or covering the excessive right holes on HD and ED to 'downgrade' them to DD format. This is to resolve compatibility issues with older devices using DD disks like some electronic keyboard instruments and samplers, where DD disks are useful since factories reduced manufacturing of such disks after the mid-1990s. By default, many older HD drives recognize ED disks as DD since they lack the HD-specific holes and the drives cannot detect the ED-specific hole; most DD drives handle ED and even HD disks as DD.