Found format "ibm"
PLL Parameters: period_adj=5% phase_adj=60%
Side 0:
 T0: IBM-MFM DD (15 256-byte sectors, 3840 bytes)
 T1-39: IBM-MFM DD (16 256-byte sectors, 4096 bytes)
 T40-79: Unformatted*
 T80-83: Unformatted
Side 1:
 T0-79: Unformatted*
 T80-83: Unformatted