console
I should mention that this problem originated after ejecting a disc. As the disc ejected I heard a sort-of grinding noise...
...there appears to be no change in console, but under the March 20th records (when I first had this problem), I have a ton of errors all similar to the following:
Apr 20 18:23:01 sunny kernel: disk1: I/O error.
Apr 20 18:23:02 sunny kernel: SAM Multimedia: READ or WRITE failed, ASC = 0x09, ASCQ = 0x00
Apr 20 18:23:02 sunny kernel: SAM Multimedia: READ or WRITE failed, ASC = 0x16, ASCQ = 0x00
Apr 20 18:23:03 sunny kernel: SAM Multimedia: READ or WRITE failed, ASC = 0x16, ASCQ = 0x00
Apr 20 18:23:04 sunny kernel: SAM Multimedia: READ or WRITE failed, ASC = 0x09, ASCQ = 0x00
Apr 20 18:23:04 sunny kernel: SAM Multimedia: READ or WRITE failed, ASC = 0x09, ASCQ = 0x00
Apr 20 18:23:04 sunny kernel: disk1: I/O error.
Apr 20 18:23:04 sunny kernel: SAM Multimedia: READ or WRITE failed, ASC = 0x16, ASCQ = 0x00
Apr 20 18:23:11 sunny last message repeated 3 times