Errors from ata6:00 -- How to find corresponding device?

[Chris Tyler]

I'm getting tons of messages in /var/log/messages about 'ata6' or
'ata6:00':

Nov  7 11:16:21 concord3 kernel: ata6.00: exception Emask 0x0 SAct 0x0
SErr 0x0 action 0x6 frozen
Nov  7 11:16:21 concord3 kernel: ata6.00: cmd
a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
Nov  7 11:16:21 concord3 kernel:         cdb 00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00
Nov  7 11:16:21 concord3 kernel:         res
40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
Nov  7 11:16:21 concord3 kernel: ata6.00: status: { DRDY }
Nov  7 11:16:21 concord3 kernel: ata6: soft resetting link
Nov  7 11:16:21 concord3 kernel: ata6.00: configured for PIO0
Nov  7 11:16:21 concord3 kernel: ata6: EH complete

The problem is that I can't figure out which device this corresponds to.
The possibilities are /dev/sd[a-c] (3 sata 500G drives) or /dev/sr0
(sata dvd writer).

What does the 6 or 6:00 correspond to? It doesn't appear to be a major
or minor device number, or correspond to any entries in /sys that I can
find. If the 6 is not the device (but rather the driver version or
something), is there any part of these messages that indicate which
device is associated with the error?

Any pointers appreciated!--

-Chris