Questions on dumping low density Macintosh disks - Printable Version +- CBMSTUFF FORUM (https://www.cbmstuff.com/forum) +-- Forum: CBMSTUFF PRODUCTS (https://www.cbmstuff.com/forum/forumdisplay.php?fid=1) +--- Forum: SuperCard Pro (https://www.cbmstuff.com/forum/forumdisplay.php?fid=3) +---- Forum: Other disks (https://www.cbmstuff.com/forum/forumdisplay.php?fid=14) +---- Thread: Questions on dumping low density Macintosh disks (/showthread.php?tid=260) |
Questions on dumping low density Macintosh disks - floppydumper - 11-18-2015 I'm backing up some old commercial Mac games which are on LD 3.5" disks. Is there any reason to have the drive set to "High Density" for this, or will "Low Density" capture everything needed? Also, is there a good way to verify my dumps short of just writing them back to disks immediately? I've been using the scan option of Samdisk to verify my dumped PC stuff, but it apparently only supports MFM and FM encoding, so I can't use it for this task (Mac disks are GCR). Thanks! RE: Questions on dumping low density Macintosh disks - admin - 11-18-2015 I have only used low density for imaging Mac disks. I don't know of any programs (other than what I wrote for the Amiga) for verifying Mac disks. RE: Questions on dumping low density Macintosh disks - SomeGuy - 11-18-2015 Really, somebody needs to bug the HxC folks about implementing Mac conversion support. However unless I am mistaken, their emulator hardware won't connect to a Mac, so they probably don't care about Mac. Mac 400k/800k disks are a real headache. Not only are they CGR encoded, and they don't use the index pulse, but they use variable bit rates! On a real mac, the drive motor spins at a different speed depending on what track it is on. Of course, the SCP copies whatever bit rate it sees. The following uses the PCE tools to decode a Mac sector image from an SCP file. It outputs a list of sectors and any errors it has found to a text file. I'm not sure if the following is 100% correct, I only have a couple of mac disks to test with. If you get about one CRC error on each track, then the disk was probably not written index-aligned, and the disk needs to be read using splice mode. Code: pfi "Your File Name Here.scp" disk1.pfi RE: Questions on dumping low density Macintosh disks - floppydumper - 11-23-2015 SomeGuy, This is fantastically useful. I'm doing PC disks right now, but this will definitely be useful when I get done with those. Thanks a ton! |