> Is it possible to turn on some kind of timestamps or sequence numbers in 
> dmesg?

No.

> When I ocassionally get an error message (uncorrectable error on CD), I would
> like to know if I got one recently or not. Difficult to distinguish 1000 and
> 1001 messages of this type in dmesg otherwise.

syslogd remembers when the kernel gave it messages, and puts the timestamp
into the syslog output files.

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