Comment 90 for bug 106063

Still have this problem with the -15.27 kernel : revalidation failed (errno=-19), rejecting I/O to dead device, exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2...

Also an interesting message in my dmesg :
[ 20.368000] ata1.00: model number mismatch 'SAMSUNG HM120JC' != 'SAOSWNG JM322JC " " " " " " " " " " " "'
[ 20.368000] ata1.00: revalidation failed (errno=-19)

So it seems that there is a communication error with the HDD since even the model number mismatches..

See also bug #104581 for more details and reports from other users.