Re: Copying Mac MFS disks on an Apple II

[Eric Smith <eric-no-spam-for-me@brouhaha.com>]

willi@wilserv.com (Willi Kusche) writes:
>     Any suggestions as to how to do that?  Copying on a IIgs puts some
> of the blocks on the second side of the output disk.  I'm wondering if
> a program that copies 8 blocks (a track) then writes 8 blocks of nulls
> and repeats that sequence will cause all 800 blocks of the input disk
> to wind up one side of the output disk.

I don't think that will work correctly, because the address fields of
the sectors will be correct for Apple II 800K format, but you need Mac
400K format.  Also, if you want a proper copy of an MFS diskette, you
need to copy the tags, not just the data.  Each sector of the Apple 400K
and 800K diskette formats have an addition 12 bytes (or was it 20
bytes?) of tag data.  The Apple II does not normally use the tags; I'm
not sure whether the disk driver has calls that allow reading and
writing the tags.

One of the bytes in the address field indicates whether the diskette
is formatted for the Mac or the Apple II.  I don't think the Mac will
care if it is wrong, though.  The Mac .SONY driver is capable of
formatting diskettes with that set for either Mac or Apple II, and
the Apple DiskCopy program on the Mac will preserve the value when
it copies image files to diskeetes and vice versa.