Found format "ibm_mfm_dd"
PLL Parameters: period_adj=5% phase_adj=60%
T0.0-79.0: IBM-MFM DD (16 256-byte sectors, 4096 bytes)
T79.1: IBM-MFM DD (15 256-byte sectors, 3840 bytes)
T80.0-83.1: Unformatted
