ata14 HSM Violation

Here too, after upgrading to Ubuntu 14.10 I see these lines in my dmesg output

[ 3.192349] ata14.00: exception Emask 0x1 SAct 0x0 SErr 0x0 action 0x6 <-- printed in red
[ 3.192395] ata14.00: irq_stat 0x40000001 <-- printed in red
[ 3.192436] scsi 13:0:0:0: CDB:
[ 3.192437] Inquiry: 12 01 00 00 ff 00
[ 3.192444] ata14.00: cmd a0/01:00:00:00:01/00:00:00:00:00/a0 tag 2 dma 16640 in
         res 00/00:00:00:00:00/00:00:00:00:00/00 Emask 0x3 (HSM violation) <-- printed in red
[ 3.192505] ata14: hard resetting link
[ 3.520309] ata14: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 3.520696] ata14.00: configured for UDMA/66
[ 3.520821] ata14: EH complete

Any ideas where the exception and HSM violation is coming from and whawt we can do? It's printed in red.

Thanks!