On 1/19/09, Steven Hirsch <snhirsch at gmail.com> wrote: > > Are you quite sure that the CoCo writes a sector id of 0? > The standard CoCo formats (OS-9 RBF and Disk Basic) do NOT use a sector number of 0. The sector numbers in the ID fields are numbered 1 to 18, even on the second side of a double-sided OS-9 disk. Darren