In case it helps, I checked the SMART status of the drives too. Only the drive associated with ata1 has errors in its SMART error log. However, the drive is reporting as healthy, and running a long selftest produced no errors, and no change in the "healthy" state of the drive according to SMART. I dont know enough about this to understand if the errors in the log are causing the problems I'm seeing, or as a result of them. I've attached the output from running "sudo smartctl --all" for each of the drives to this post in the hope it will be of use.
** Attachment added: "smartctl-all.log" http://launchpadlibrarian.net/10261847/smartctl-all.log -- Port slow to respond on SiI3512 with sata_sil https://bugs.launchpad.net/bugs/159521 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs