Found format "ibm" PLL Parameters: period_adj=5% phase_adj=60% T0.0-71.0: IBM-MFM DD (16 256-byte sectors, 4096 bytes) T71.1: IBM-MFM DD (15 256-byte sectors, 3840 bytes) T72.0-79.1: IBM-MFM DD (16 256-byte sectors, 4096 bytes) T80.0-83.1: Unformatted
