I receive the same "biosdisk read error" displayed briefly before my
grub menu is displayed.

On my system, the error occurs right after grub does a seek to the
floppy drive, after grub loads but before the menu is displayed.  So
thinking the seek and the error were related, I decided to test that
theory.

I found that if I have a formatted floppy in the floppy drive, I don't
get the error.

That leads me to believe that there's a problem with the processing of
the search command in grub.cfg.  My version of the command is:

search --no-floppy --fs-uuid --set 387a3584-1f7f-470e-bb9b-89346e2edf22

I couldn't find any documentation on the search command in the grub
wiki, but if the purpose of the search command is to identify all the
bios devices and raid devices that later grub.cfg commands use to boot
OS's, shouldn't "--no-floppy" prevent grub from looking at the floppy
drive at all?

The error is more of an annoyance than a problem as my system also
continues on to boot from my raid1, but I'd be curious to know if others
that are getting the error can work around by putting a floppy in the
floppy drive...

My grub version is:  GNU GRUB 1.97~beta4

-- 
grub2 shows 'biosdisk read error', then boots
https://bugs.launchpad.net/bugs/396564
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