Disc Drive Emulator Mac
Disc image emulator free download - Disc Image, Virtual Original CD Drive Emulator, MagicDisc, and many more programs. ImgDrive is a CD/DVD/BD emulator - a tool that allows you to mount optical disc images by simply clicking on them in Windows Explorer. 
OK, I think I’ve fixed the bug that was causing all the retries and reseeks to track 0, bloating the read times. Now it reads through an entire floppy image without any retries– hooray! But it’s still slower than a real floppy: 57 seconds to read an 800K disk, vs 41 for a real floppy in my most recent test. I’m wondering if this has something to do with how the sectors are interleaved and organized on a real floppy. On my emulated floppy, the sectors in each track appear in consecutive ascending order, and every time the drive steps or switches sides, it jumps to the first sector on that track. I’m wondering if real floppies are formatted with a 2:1 interleave, so sectors appear in order like 0 4 1 5 2 6 3 7 instead of 0 1 2 3 4 5 6 7. I also seem to remember reading somewhere that a real floppy offsets the location of the first sector in each track from the location of the first sector in the previous track.
There are a bunch of tricks like that which can help reduce the number of times the disk must make a complete rotation before the Mac reads all the sectors from a track, basically trying to match the access pattern of the Mac with the organization of the sectors on the disk. In a perfect world, the Mac would always read all the sectors from a track in one pass, with the disk only making a single rotation. My debug info shows this does happen with my emulated floppy, but only rarely. With a real floppy this should be rare too, because it would require the lucky chance of a read operation beginning just as the first sector of the track approached the read head. With a random starting position, two rotations of the disk should always be enough to read the whole track, assuming the Mac is fast enough to keep up. But my debug info shows that most of the time, it takes about three “rotations” of the emulated disk to read a whole track.
My measured disk read times of 57 vs 41 seconds make roughly a 3:2 ratio, so maybe there’s something to that. Yes, the HxC emulator is a nice program, I’ve mentioned it here before. I’m getting a little worried about supporting writes now. I did some tests and found that track-to-track step times must be no more than 12ms for the floppy driver to work. If I need to write a full track’s worth of sectors to the SD card during the step time, I’m not sure 12ms will be long enough. I may need to do writes in the background instead, using interrupts or some other method.
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