Comment 2 for bug 750380

Last lines of growisofs:
 3861479424/7838695424 (49.3%) @4.0x, remaining 12:47 RBU 100.0% UBU 93.8%
 3880157184/7838695424 (49.5%) @4.0x, remaining 12:44 RBU 99.9% UBU 90.6%
 3894476800/7838695424 (49.7%) @3.1x, remaining 12:41 RBU 100.0% UBU 90.6%
 3913121792/7838695424 (49.9%) @4.0x, remaining 12:37 RBU 100.0% UBU 90.6%
 3919314944/7838695424 (50.0%) @1.3x, remaining 12:39 RBU 100.0% UBU 90.6%
 3919314944/7838695424 (50.0%) @0.0x, remaining 12:42 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 12:46 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 12:49 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 12:52 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 12:56 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 12:59 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:02 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:06 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:09 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:12 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:16 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:19 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:22 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:26 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:29 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:32 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:36 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:39 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:42 RBU 100.0% UBU 100.0%
 3919314944/7838695424 (50.0%) @0.0x, remaining 13:46 RBU 100.0% UBU 100.0%
:-[ WRITE@LBA=1d3380h failed with SK=0h/ASC=00h/ACQ=03h]: Input/output error
:-( write failed: Input/output error

and dmesg

[29196.000077] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[29196.000090] sr 3:0:0:0: [sr0] CDB: Write(10): 2a 00 00 1d 33 80 00 00 10 00
[29196.000120] ata4.00: cmd a0/00:00:00:00:80/00:00:00:00:00/a0 tag 0 pio 32768 out
[29196.000124] res 40/00:03:00:0c:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[29196.000131] ata4.00: status: { DRDY }
[29196.000142] ata4: hard resetting link
[29196.320039] ata4: SATA link down (SStatus 100 SControl 300)