09-12-2018, 03:40 AM
Yes, I figured that the IBM 1.44 MB disk type would work for Mac HD disks, and indeed, I have successfully imaged and duplicated such a disk.
I've made some interesting progress with a commercial 800K disk (not made by Apple, though). Index mode never works, and neither does splice mode with the default 2 revolutions. However, after using splice mode with the maximum 5 revolutions, I got the following results with the duplicated disk in the real Macintosh: after I insert the disk, the drive motor chugs along for around 20 seconds, then finally, the disk mounts. However, when I tried to run the program on the disk, again the drive chugged and chugged, but then spat out a disk read error. When using the original disk, it mounts almost instantly, and the program runs fine.
That was with the Epson SD-800. I retried the same procedure with the Imation drive, but the disk would not mount (there seemed to be a little more chugging by the drive than usual, though).
Therefore, I'm pretty convinced that it's in fact the drives that I'm using with the SCP that are the issue. They can't handle the variable bit rate. The SD-800 almost could, but not quite. I'm going to try some other drives, then report back. However, my findings also bring up the question of whether I could write a perfect working disk if more than 5 revolutions in splice mode were available...
I've made some interesting progress with a commercial 800K disk (not made by Apple, though). Index mode never works, and neither does splice mode with the default 2 revolutions. However, after using splice mode with the maximum 5 revolutions, I got the following results with the duplicated disk in the real Macintosh: after I insert the disk, the drive motor chugs along for around 20 seconds, then finally, the disk mounts. However, when I tried to run the program on the disk, again the drive chugged and chugged, but then spat out a disk read error. When using the original disk, it mounts almost instantly, and the program runs fine.
That was with the Epson SD-800. I retried the same procedure with the Imation drive, but the disk would not mount (there seemed to be a little more chugging by the drive than usual, though).
Therefore, I'm pretty convinced that it's in fact the drives that I'm using with the SCP that are the issue. They can't handle the variable bit rate. The SD-800 almost could, but not quite. I'm going to try some other drives, then report back. However, my findings also bring up the question of whether I could write a perfect working disk if more than 5 revolutions in splice mode were available...