$ sudo geom disk list Geom name: cd0 Providers: 1. Name: cd0 Mediasize: 2048 (2.0K) Sectorsize: 2048 Mode: r0w0e0 descr: MATSHITA DVD-RAM UJ8E2 ident: (null) rotationrate: unknown fwsectors: 0 fwheads: 0