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Date: Wed, 31 Jul 2013 21:11:22 +0300
From: Thanasis <thanasis@asyr.hopto.org>
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Subject: [gentoo-user] ata6: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen
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Early during booting phase, dmesg shows:

[    0.515651] ata6: SATA max UDMA/133 abar m8192@0xfdefe000 port
0xfdefe180 irq 17
[    0.833387] ata6: SATA link down (SStatus 0 SControl 300)

But later, it reports lots like the following stanza:

[164362.715469] ata6: exception Emask 0x10 SAct 0x0 SErr 0x4000000
action 0xe frozen
[164362.715474] ata6: irq_stat 0x00000040, connection status changed
[164362.715479] ata6: SError: { DevExch }
[164362.715490] ata6: hard resetting link
[164363.433615] ata6: SATA link down (SStatus 0 SControl 300)
[164363.446934] ata6: EH complete

Is it related to a disk drive, and if so, is there a way to know which
drive is on ata6?

PS: There are two drives attached to the system, reported by dmesg like so:
[    0.872490] sd 0:0:0:0: [sda] 156301488 512-byte logical blocks:
(80.0 GB/74.5 GiB)
[    0.874828] sd 1:0:0:0: [sdb] 488397168 512-byte logical blocks: (250
GB/232 GiB)