I got like 20 sec. freeze at booting when:
Code:
[   35.998713] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[   35.998728] ata3.00: failed command: IDENTIFY PACKET DEVICE
[   35.998743] ata3.00: cmd a1/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in
         res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[   35.998751] ata3.00: status: { DRDY }
[   35.998760] ata3: hard resetting link
[   36.458760] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   37.261471] ata3.00: configured for PIO4
[   38.062232] ata3: EH complete
and:
Code:
[   69.030206] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[   69.030220] ata3.00: failed command: IDENTIFY PACKET DEVICE
[   69.030235] ata3.00: cmd a1/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in
         res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[   69.030243] ata3.00: status: { DRDY }
[   69.030252] ata3: hard resetting link
I was reading some Google's results and it looks like a bug. Any information?.

Complete dmesg here.