That's what I see for both .dsk/.os9 and .vhd images but the byte at $0D is always $FF. I don't know why your value changes. Bob Devries wrote: > attr /h0 gives what I'd expect: d-ewrewr > Ded /h0@ shows no problems. The disk attributes at offset $0D is $FF. > It isn't a permanent condition, either. re-loading MESS clears it. >