It is a disk error and to prevent more damage to the filesystem, the > kernel remounted the filesystem read-only. Check the output for `dmesg`. > My gut feeling says your disk is near or at "End of Life". > > Try to run a `/sbin/badblocks /dev/sda`, where you replace /dev/sda with > the correct device name. >
No,No,No! if it is failing, badblocks could push it over the edge. Do 'skdump /dev/sdc' or whatever your external device is at. This should report the diagnostic data from the disk controller. Look for reallocated sectors and current pending sectors. If you are inquisitive you can run firmware tests 'smartctl -t short /dev/sdc' (or -t long), and wait the reported number of minutes and do skdump or smartctl -a again. The warranties on disks are fairly long, so if the SMART status reports failure you may be eligible for a replacement.
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