Herbert,

when I said 'did you destructively read the status register' I meant
whether you were reading the main or the alternate status register. You
usually poll the alternate status r. (which is non-destructive) and then
at the end of a command phase and before issuing new data you read the
proper status register, because this clears some flags in the drive (read
the specs carefully). There may be faster ways to do this, but this is
'safe'.

To find out if your drive supports LBA analyze the output from the status
command (drive id). If it says it's LBA it has LBA. There are online drive
databases. Type your drive model number into a search engine on the web.

Peter

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