I'd think 1541s are plentiful, but the actual 5.25" disks would be an issue. On the other hand, 3.5" disks are probably more readily available, but how common are 1581s? Maybe they're both no-gos?
Before anyone asks, anything I make myself is going to work from the SD card just fine, it's just that at some point, I wanted to experiment with writing something that could work from one or more disks, just to see what it's like since it's something I never got to do.
![Razz :P](./images/smilies/icon_razz.gif)