Comment 59 for bug 397096

Problem vanished for a day, but back again.
Strangely, when in SATA mode, it gives errors reported in this post.
When in AHCI mode, it gives errors reported in this bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/285892

[ 1550.000084] ata3.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
[ 1550.000097] ata3.00: failed command: WRITE FPDMA QUEUED
[ 1550.000114] ata3.00: cmd 61/10:00:23:82:2f/00:00:08:00:00/40 tag 0 ncq 8192 out
[ 1550.000117] res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
[ 1550.000125] ata3.00: status: { DRDY }
[ 1550.000135] ata3: hard resetting link
[ 1550.484467] ata3: softreset failed (device not ready)
[ 1550.484478] ata3: applying SB600 PMP SRST workaround and retrying
[ 1550.652070] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 1550.663374] ata3.00: configured for UDMA/133
[ 1550.663388] ata3.00: device reported invalid CHS sector 0
[ 1550.663410] ata3: EH complete