>> You mean, wd->sc-wdc_bio.blkno >= LBA-reported-size?

> Yes. More specifically, I mean remplace
>         if (wd->sc_flags & WDF_LBA48 &&
> 	    (wd->sc_wdc_bio.blkno > LBA48_THRESHOLD ||
> 	    (wd->sc_quirks & WD_QUIRK_FORCE_LBA48) != 0))
> with
> 	if (wd->sc_flags & WDF_LBA48 &&
> 	    wd->sc_wdc_bio.blkno > LBA-reported-size)

I would hope you actually mean >= rather than > in the last line, or
you will always be trying to access the first non-LBA sector via LBA.
(If LBA reports N sectors, that means sectors 0 through N-1 should use
LBA, with N and higher going to LBA48.)  You'll also need to save the
LBA-reported size somewhere for LBA48 disks, but that's easy enough to
arrange.

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