So you’ve seen me talk about good data and bad data. But what’s the difference?
Good data looks like the picture I posted awhile back here.
Note the very even spread of 4—4—8. Every pattern is recognizable.
Bad data, though I don’t have a picture, has many edges that are closer together, separated by long runs of empty space. These lows, instead of being roughly 4us, 6us, or 8us long, they are weird — a common one is around 2us +/-. Some of them even smaller like 1.5us.
This data is actually coming off the floppy — or at least from the drive. Eject the floppy disk, and no data comes out. This is a nice refreshing change from the amiga floppy that always seemed to be spitting out data.