Prowler, Arnie, thanks a lot! I've been trying to get a good disk image for days on an 1.3 kickstart A500 with just 1MB. AmigaExplorer host locks up, can't read from diskspare disks etc. It may be just that diskspare uses a very weak checksum, making it seem good while capturing the disk image but on the filesystem level it throws up bad block after the other. I hope it's my code, that would mean I could still recover a lot of data. AmigaDos and pc disks work very well, have much stronger checksums too.