When I think about it, a drive that can write 1.4mb is probably writing more tracks per side than a drive that writes 720-800k.
I know that is the case with using a DVD writer to make a CD - it simply writes fewer tracks and leaves bigger gaps between tracks, which is why some older CD players calibrated for wider tracks have trouble with DVD-written CDs.
If so, then a Superdrive would be writing narrower tracks which would hold a lower detectable charge. A disk written to 800k format by a Superdrive might be leaving traces of any previous format in between the new tracks. Such a disk could be read well by a Superdrive, but less well by a 800k original drive.
This still does not explain why such disks can be read a few times, then fail, consistently.
Rick
I know that is the case with using a DVD writer to make a CD - it simply writes fewer tracks and leaves bigger gaps between tracks, which is why some older CD players calibrated for wider tracks have trouble with DVD-written CDs.
If so, then a Superdrive would be writing narrower tracks which would hold a lower detectable charge. A disk written to 800k format by a Superdrive might be leaving traces of any previous format in between the new tracks. Such a disk could be read well by a Superdrive, but less well by a 800k original drive.
This still does not explain why such disks can be read a few times, then fail, consistently.
Rick