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Detail:
  The Density field in the disc record is a byte at a non-word-aligned address
  but it was being loaded here with an LDR instruction. There is actually a
  pre-existing bug here, since the code at lines 904-905 would only have been
  executed on earlier CPUs if SectorSize, SecsPerTrk and Heads were all zero
  too. This would correspond to an implausibly small hard disc, so arguably
  this part of the branch should perhaps be removed altogether?
Admin:
  Untested at ROOL.
  Submission from Willi Theiß [comments above are my own - BA]

Version 3.40. Tagged as 'FileCore-3_40'