Ubuntu file system going into "lockdown" mode

[edwardp-mh2Nk+tgbQM at public.gmane.org]

Richard Pieri wrote:
> Either save your syslog files on a different disk entirely (USB flash drive, perhaps) or to a syslog server so that when the fault happens again it can be recorded.
>    

I looked at the last-saved syslog file (syslog.1) and there were only 
two items that would seem to indicate what looks like an error.  Both of 
these were repeated in the syslog with different timestamps:

> Oct  3 18:57:45 ubuntu kernel: [   83.925182] ata1.00: error: { ICRC 
> ABRT }
> Oct  3 18:58:45 ubuntu kernel: [  143.894672] ata1.00: failed command: 
> READ DMA