odd messages at boot time

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I'm getting these messages during boot:

error: failure reading sector 0xfc from 'hd4'
error: failure reading sector 0xe0 from 'hd4'
error: failure reading sector 0x0 from 'hd4'
error: failure reading sector 0xfc from 'hd5'
error: failure reading sector 0xe0 from 'hd5'
error: failure reading sector 0x0 from 'hd5'

they pop up soon after the Grub menu with a message to press ENTER to
continue, and it times out in a few seconds if I don't press ENTER. These
messages have been appearing for a long time, at least a couple of years
and I've been too lethargic to investigate til now.

I see no bad side-effects at runtime.

I just did badblocks (read-only) on both sda and sdb (RAID-1 pair)
which found no errors.

I see nothing obviously related in dmesg, or /var/log/messages.

I also have an external box (Venus DS3R Pro-2) with two drives, also
RAID-1, that I use for backups. It is seen (after boot) as /dev/sdc.

I'd have to pull the drives out of it and connect them to the SATA bus
to run badblocks on them, as badblocks won't run on /dev/sdc.

the nightly backups on to this box appear to run without issue.

Anybody got any ideas on what this might be about?

thanks in advance!

Fred
-- 
---- Fred Smith -- fredex@xxxxxxxxxxxxxxxxxxxxxx -----------------------------
    "Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of
     heaven, but only he who does the will of my Father who is in heaven."
------------------------------ Matthew 7:21 (niv) -----------------------------
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