Possible disk problem.

On a day when I REALLY needed everything working, looks like it's died on me.
The comp booted up ok earlier on (does often take several attempts to boot up successfully, probably down to cold temperatures), but it then had a couple of errors when loading software, and I restarted hoping it would clear it up.
It's not booted since then, just gets to the 'you need to restart you computer' screen. Managed to boot it from the CD drive to have a look at what was going on, and on looking at the main volume I get the:
'"The underlying task reported failure"'
From all accounts, this is not a good thing. I've got the disk partitioned, and the second volume (where all important data is) seems OK. Really hoping I can get this sorted without loosing an info off the second volume, though I could afford to re-install everyone on the first drive.
Just wondered best way to go about things. I haven't phoned support, but I'm assuming they'll talk me through a clean install and format, and I really can't afford to loose the data. From what I can tell, the data in the 2nd volume is all OK, so how can I best go about backing it up safely?
Sorry if this all a bit vague, but just hoping there's some answers out there, I'm a little shell-shocked right now, and a little annoyed at myself for not having things backed-up fully.....
Thanks
AB

You have already tried the repair and it said that? Try running the repair several more times. If it still reports that read this Apple article on it- Apple doc.#302411.
If Disk Utility can't fix it booted up on your disk, DiskWarrior would be your best choice for directory repairs; what you have. Get the CD so you can boot from it.
Cheers!
DALE
p.s. an erase and install will fix this but you'll lose all your data.

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    ••• 1) — *BatChmod 1.6.2* (162), written by a compatriot, Renaud Boisjoly.
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    abr 21 14:02:01 echoes kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    abr 21 14:02:01 echoes kernel: ata1.00: configured for UDMA/100
    abr 21 14:02:01 echoes kernel: ata1: EH complete
    abr 21 14:02:01 echoes kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
    abr 21 14:02:01 echoes kernel: ata1.00: failed command: SMART
    abr 21 14:02:01 echoes kernel: ata1.00: cmd b0/d0:01:00:4f:c2/00:00:00:00:00/00 tag 22 pio 512 in
    res 40/00:ff:ff:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 21 14:02:01 echoes kernel: ata1.00: status: { DRDY }
    abr 21 14:02:01 echoes kernel: ata1: hard resetting link
    abr 21 14:02:01 echoes kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    abr 21 14:02:01 echoes kernel: ata1.00: configured for UDMA/100
    abr 21 14:02:01 echoes kernel: ata1: EH complete
    abr 21 14:02:01 echoes kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
    abr 21 14:02:01 echoes kernel: ata1.00: failed command: SMART
    abr 21 14:02:01 echoes kernel: ata1.00: cmd b0/da:00:00:4f:c2/00:00:00:00:00/00 tag 18
    res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 21 14:02:01 echoes kernel: ata1.00: status: { DRDY }
    abr 21 14:02:01 echoes kernel: ata1: hard resetting link
    abr 21 14:02:01 echoes kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    abr 21 14:02:01 echoes kernel: ata1.00: configured for UDMA/100
    abr 21 14:02:01 echoes kernel: ata1: EH complete
    abr 21 14:01:51 echoes udisksd[627]: Error performing housekeeping for drive /org/freedesktop/UDisks2/drives/TOSHIBA_MQ01ABD100_Y44MT611T: Error updating SMART data: sk_disk_smart_status: Input/output error (udisks-error-quark, 0)
    dmesg
    [55661.023028] ata1.00: exception Emask 0x0 SAct 0x8000 SErr 0x0 action 0x6 frozen
    [55661.023034] ata1.00: failed command: READ FPDMA QUEUED
    [55661.023040] ata1.00: cmd 60/08:78:18:08:c0/00:00:4b:00:00/40 tag 15 ncq 4096 in
    res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    [55661.023042] ata1.00: status: { DRDY }
    [55661.023046] ata1: hard resetting link
    [55666.358537] ata1: link is slow to respond, please be patient (ready=0)
    [55671.053813] ata1: COMRESET failed (errno=-16)
    [55671.053819] ata1: hard resetting link
    [55676.389438] ata1: link is slow to respond, please be patient (ready=0)
    [55678.897149] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    [55681.320305] ata1.00: configured for UDMA/100
    [55681.320319] ata1.00: device reported invalid CHS sector 0
    [55681.320349] ata1: EH complete
    [55729.969443] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
    [55729.969588] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
    dmesg
    [102884.889930] systemd[1]: systemd-journald.service: main process exited, code=dumped, status=6/ABRT
    [102884.890305] systemd[1]: Unit systemd-journald.service entered failed state.
    [102884.890333] systemd[1]: systemd-journald.service failed.
    [102885.560745] systemd-coredump[28916]: Detected coredump of the journal daemon itself, diverted to /var/lib/systemd/coredump/core.systemd-journal.0.5bf9a012fed048ce8975998cf3c3c20e.6705.1427990901000000.
    [102885.860957] systemd-journald[28919]: File /var/log/journal/b130c96d1371445d9ddeb40c51c77dd6/system.journal corrupted or uncleanly shut down, renaming and replacing.
    [102921.797810] systemd-journald[28919]: File /var/log/journal/b130c96d1371445d9ddeb40c51c77dd6/user-1000.journal corrupted or uncleanly shut down, renaming and replacing.
    [104179.117363] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
    [104179.117369] ata1.00: failed command: READ FPDMA QUEUED
    [104179.117375] ata1.00: cmd 60/08:00:48:88:8b/00:00:4d:00:00/40 tag 0 ncq 4096 in
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    [104179.117377] ata1.00: status: { DRDY }
    [104179.117381] ata1: hard resetting link
    [104184.453382] ata1: link is slow to respond, please be patient (ready=0)
    [104189.149114] ata1: COMRESET failed (errno=-16)
    [104189.149121] ata1: hard resetting link
    [104189.469276] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    [104189.952982] ata1.00: configured for UDMA/100
    [104189.952989] ata1.00: device reported invalid CHS sector 0
    [104189.953004] ata1: EH complete
    [104508.223792] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
    [104508.223798] ata1.00: failed command: SMART
    [104508.223803] ata1.00: cmd b0/da:00:00:4f:c2/00:00:00:00:00/00 tag 2
    res 40/00:ff:80:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    [104508.223806] ata1.00: status: { DRDY }
    [104508.223810] ata1: hard resetting link
    [104509.984601] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    [104510.698126] ata1.00: configured for UDMA/100
    [104510.698157] ata1: EH complete
    One of the latest and worse
    journalctl -xfa --system
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:00:e0:d6:75/00:00:00:00:00/40 tag 0 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:08:08:d8:75/00:00:00:00:00/40 tag 1 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:10:30:d9:75/00:00:00:00:00/40 tag 2 ncq 4096 out
    res 40/00:ff:80:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:18:58:da:75/00:00:00:00:00/40 tag 3 ncq 4096 out
    res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:20:e8:e5:75/00:00:00:00:00/40 tag 4 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:28:80:db:75/00:00:00:00:00/40 tag 5 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:30:68:dd:75/00:00:00:00:00/40 tag 6 ncq 4096 out
    res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:38:90:de:75/00:00:00:00:00/40 tag 7 ncq 4096 out
    res 40/00:ff:80:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:40:b8:df:75/00:00:00:00:00/40 tag 8 ncq 4096 out
    res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:48:90:e1:75/00:00:00:00:00/40 tag 9 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:50:98:e3:75/00:00:00:00:00/40 tag 10 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:58:c0:e4:75/00:00:00:00:00/40 tag 11 ncq 4096 out
    res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/c8:78:28:b9:2a/0b:00:4e:00:00/40 tag 15 ncq 1544192 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:80:b0:4b:c0/00:00:4f:00:00/40 tag 16 ncq 4096 out
    res 40/00:ff:80:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/10:88:90:4b:80/00:00:50:00:00/40 tag 17 ncq 8192 out
    res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:90:98:22:81/00:00:50:00:00/40 tag 18 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:98:00:0e:00/00:00:5f:00:00/40 tag 19 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:a0:00:08:80/00:00:5f:00:00/40 tag 20 ncq 4096 out
    res 40/00:ff:ff:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:a8:80:08:80/00:00:5f:00:00/40 tag 21 ncq 4096 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/10:b0:08:0b:81/00:00:5f:00:00/40 tag 22 ncq 8192 out
    res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:b8:70:c8:75/00:00:00:00:00/40 tag 23 ncq 4096 out
    res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:c0:20:c9:75/00:00:00:00:00/40 tag 24 ncq 4096 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:c8:88:c9:75/00:00:00:00:00/40 tag 25 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:d0:58:ca:75/00:00:00:00:00/40 tag 26 ncq 4096 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:d8:a0:ce:75/00:00:00:00:00/40 tag 27 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:e0:68:d3:75/00:00:00:00:00/40 tag 28 ncq 4096 out
    res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:e8:90:d4:75/00:00:00:00:00/40 tag 29 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: WRITE FPDMA QUEUED
    abr 22 12:57:11 echoes kernel: ata1.00: cmd 61/08:f0:b8:d5:75/00:00:00:00:00/40 tag 30 ncq 4096 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1: hard resetting link
    abr 22 12:57:11 echoes kernel: ata1: link is slow to respond, please be patient (ready=0)
    abr 22 12:57:11 echoes kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    abr 22 12:57:11 echoes kernel: ata1.00: configured for UDMA/100
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: ata1.00: device reported invalid CHS sector 0
    abr 22 12:57:11 echoes kernel: sd 0:0:0:0: [sda] UNKNOWN Result: hostbyte=0x00 driverbyte=0x06
    abr 22 12:57:11 echoes kernel: sd 0:0:0:0: [sda] CDB:
    abr 22 12:57:11 echoes kernel: cdb[0]=0x2a: 2a 00 12 88 d7 c0 00 04 d0 00
    abr 22 12:57:11 echoes kernel: blk_update_request: I/O error, dev sda, sector 310958016
    abr 22 12:57:11 echoes kernel: EXT4-fs warning (device sda2): ext4_end_bio:317: I/O error -5 writing to inode 36311758 (offset 8388608 size 2695168 starting block 38869906)
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995128
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995129
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995130
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995131
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995132
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995133
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995134
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995135
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995136
    abr 22 12:57:11 echoes kernel: Buffer I/O error on device sda2, logical block 19995137
    abr 22 12:57:11 echoes kernel: sd 0:0:0:0: [sda] UNKNOWN Result: hostbyte=0x00 driverbyte=0x06
    abr 22 12:57:11 echoes kernel: sd 0:0:0:0: [sda] CDB:
    abr 22 12:57:11 echoes kernel: cdb[0]=0x2a: 2a 00 4b dd 39 88 00 01 78 00
    abr 22 12:57:11 echoes kernel: blk_update_request: I/O error, dev sda, sector 1272789384
    abr 22 12:57:11 echoes kernel: EXT4-fs warning (device sda2): ext4_end_bio:317: I/O error -5 writing to inode 34999445 (offset 0 size 192512 starting block 159098720)
    abr 22 12:57:11 echoes kernel: sd 0:0:0:0: [sda] UNKNOWN Result: hostbyte=0x00 driverbyte=0x06
    abr 22 12:57:11 echoes kernel: sd 0:0:0:0: [sda] CDB:
    abr 22 12:57:11 echoes kernel: cdb[0]=0x2a: 2a 00 4e 2a b3 e8 00 05 40 00
    abr 22 12:57:11 echoes kernel: blk_update_request: I/O error, dev sda, sector 1311421416
    abr 22 12:57:11 echoes kernel: EXT4-fs warning (device sda2): ext4_end_bio:317: I/O error -5 writing to inode 35001016 (offset 0 size 2232320 starting block 163927845)
    abr 22 12:57:11 echoes kernel: ata1: EH complete
    abr 22 12:57:11 echoes kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
    abr 22 12:57:11 echoes kernel: ata1.00: failed command: CHECK POWER MODE
    abr 22 12:57:11 echoes kernel: ata1.00: cmd e5/00:00:00:00:00/00:00:00:00:00/00 tag 25
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    abr 22 12:57:11 echoes kernel: ata1.00: status: { DRDY }
    abr 22 12:57:11 echoes kernel: ata1: hard resetting link
    abr 22 12:57:11 echoes kernel: ata1: link is slow to respond, please be patient (ready=0)
    abr 22 12:57:11 echoes kernel: ata1: COMRESET failed (errno=-16)
    abr 22 12:57:11 echoes kernel: ata1: hard resetting link
    abr 22 12:57:11 echoes kernel: ata1: link is slow to respond, please be patient (ready=0)
    abr 22 12:57:11 echoes kernel: ata1: COMRESET failed (errno=-16)
    abr 22 12:57:11 echoes kernel: ata1: hard resetting link
    abr 22 12:57:11 echoes kernel: ata1: link is slow to respond, please be patient (ready=0)
    abr 22 12:57:11 echoes kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    abr 22 12:57:11 echoes kernel: ata1.00: configured for UDMA/100
    abr 22 12:57:11 echoes kernel: ata1: EH complete
    Current smart status:
    smartctl 6.3 2014-07-26 r3976 [x86_64-linux-4.0.1-1-ARCH] (local build)
    Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org
    === START OF INFORMATION SECTION ===
    Model Family: Toshiba 2.5" HDD MQ01ABD...
    Device Model: TOSHIBA MQ01ABD100
    Serial Number: Y44MT611T
    LU WWN Device Id: 5 000039 5e1a80e85
    Firmware Version: AX1P5E
    User Capacity: 1,000,204,886,016 bytes [1.00 TB]
    Sector Sizes: 512 bytes logical, 4096 bytes physical
    Rotation Rate: 5400 rpm
    Form Factor: 2.5 inches
    Device is: In smartctl database [for details use: -P show]
    ATA Version is: ATA8-ACS (minor revision not indicated)
    SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
    Local Time is: Sun May 3 16:42:06 2015 ART
    SMART support is: Available - device has SMART capability.
    SMART support is: Enabled
    === START OF READ SMART DATA SECTION ===
    SMART overall-health self-assessment test result: PASSED
    General SMART Values:
    Offline data collection status: (0x82) Offline data collection activity
    was completed without error.
    Auto Offline Data Collection: Enabled.
    Self-test execution status: ( 0) The previous self-test routine completed
    without error or no self-test has ever
    been run.
    Total time to complete Offline
    data collection: ( 120) seconds.
    Offline data collection
    capabilities: (0x5b) SMART execute Offline immediate.
    Auto Offline data collection on/off support.
    Suspend Offline collection upon new
    command.
    Offline surface scan supported.
    Self-test supported.
    No Conveyance Self-test supported.
    Selective Self-test supported.
    SMART capabilities: (0x0003) Saves SMART data before entering
    power-saving mode.
    Supports SMART auto save timer.
    Error logging capability: (0x01) Error logging supported.
    General Purpose Logging supported.
    Short self-test routine
    recommended polling time: ( 2) minutes.
    Extended self-test routine
    recommended polling time: ( 234) minutes.
    SCT capabilities: (0x003d) SCT Status supported.
    SCT Error Recovery Control supported.
    SCT Feature Control supported.
    SCT Data Table supported.
    SMART Attributes Data Structure revision number: 16
    Vendor Specific SMART Attributes with Thresholds:
    ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
    1 Raw_Read_Error_Rate 0x000b 100 100 050 Pre-fail Always - 0
    2 Throughput_Performance 0x0005 100 100 050 Pre-fail Offline - 0
    3 Spin_Up_Time 0x0027 100 100 001 Pre-fail Always - 1671
    4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 306
    5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 152
    7 Seek_Error_Rate 0x000b 100 100 050 Pre-fail Always - 0
    8 Seek_Time_Performance 0x0005 100 100 050 Pre-fail Offline - 0
    9 Power_On_Hours 0x0032 099 099 000 Old_age Always - 699
    10 Spin_Retry_Count 0x0033 106 100 030 Pre-fail Always - 0
    12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 300
    191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 216
    192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 14
    193 Load_Cycle_Count 0x0032 099 099 000 Old_age Always - 14140
    194 Temperature_Celsius 0x0022 100 100 000 Old_age Always - 34 (Min/Max 16/44)
    196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 19
    197 Current_Pending_Sector 0x0032 100 100 000 Old_age Always - 0
    198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline - 0
    199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
    220 Disk_Shift 0x0002 100 100 000 Old_age Always - 0
    222 Loaded_Hours 0x0032 099 099 000 Old_age Always - 515
    223 Load_Retry_Count 0x0032 100 100 000 Old_age Always - 0
    224 Load_Friction 0x0022 100 100 000 Old_age Always - 0
    226 Load-in_Time 0x0026 100 100 000 Old_age Always - 190
    240 Head_Flying_Hours 0x0001 100 100 001 Pre-fail Offline - 0
    SMART Error Log Version: 1
    No Errors Logged
    SMART Self-test log structure revision number 1
    Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
    # 1 Vendor (0x50) Completed without error 00% 611 -
    # 2 Short offline Completed without error 00% 611 -
    # 3 Short offline Completed without error 00% 597 -
    # 4 Vendor (0x50) Completed without error 00% 583 -
    # 5 Short offline Completed without error 00% 583 -
    # 6 Vendor (0x50) Completed without error 00% 575 -
    # 7 Short offline Completed without error 00% 575 -
    # 8 Short offline Completed without error 00% 547 -
    # 9 Extended offline Completed without error 00% 529 -
    #10 Short offline Completed without error 00% 355 -
    #11 Short offline Completed without error 00% 355 -
    #12 Extended offline Aborted by host 70% 355 -
    #13 Short offline Completed without error 00% 319 -
    #14 Vendor (0x50) Completed without error 00% 13 -
    #15 Short offline Completed without error 00% 13 -
    #16 Short offline Completed without error 00% 12 -
    SMART Selective self-test log data structure revision number 1
    SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
    1 0 0 Not_testing
    2 0 0 Not_testing
    3 0 0 Not_testing
    4 0 0 Not_testing
    5 0 0 Not_testing
    Selective self-test flags (0x0):
    After scanning selected spans, do NOT read-scan remainder of disk.
    If Selective self-test is pending on power-up, resume after 0 minute delay.
    Kernels used have been from 3.9 to current: Linux echoes 4.0.1-1-ARCH #1 SMP PREEMPT Wed Apr 29 12:00:26 CEST 2015 x86_64 GNU/Linux
    Last edited by jesu (2015-05-03 19:42:53)

    Something i'd noticed both the first time i was on arch and now i've reinstalled it, was that at first i didn't have this problem. I mean, when Arch was just installed. While i was installing and setting up everything.
    Now, i'm not 100% sure about this, but i think problems began when using my current user. Disk is partitioned the following way:
    $ lsblk
    NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
    sda 8:0 0 931,5G 0 disk
    ├─sda1 8:1 0 1000M 0 part
    ├─sda2 8:2 0 260M 0 part /boot
    ├─sda3 8:3 0 207,7G 0 part
    ├─sda4 8:4 0 25G 0 part
    ├─sda5 8:5 0 14,8G 0 part
    ├─sda6 8:6 0 80,5G 0 part /
    ├─sda8 8:8 0 599G 0 part /home
    └─sda9 8:9 0 2G 0 part [SWAP]
    So, i believe problems, for some reason, are related (and were related), both before and now, to the /home partition, /dev/sda8 in this ocassion.
    Because of this, i booted into systemd rescue mode, like root, rw, and unmounted /home partition. Despite root-only limitations, i used the system for a couple of hours, started lxqt, browsed the web mainly, and experienced no problem at all.
    Now i booted normally, with my regular user, and these problems are experienced just like before (and almost instantly, like 3 or 5 minutes after starting system use).
    dmesg this time showed a some different log, though it's not the first time i see this. I just didn't saved that kind of log before.
    [ 653.821719] ata1.00: exception Emask 0x0 SAct 0x100 SErr 0x0 action 0x6 frozen
    [ 653.821726] ata1.00: failed command: READ FPDMA QUEUED
    [ 653.821732] ata1.00: cmd 60/08:40:60:25:43/00:00:1b:00:00/40 tag 8 ncq 4096 in
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    [ 653.821735] ata1.00: status: { DRDY }
    [ 653.821739] ata1: hard resetting link
    [ 659.156760] ata1: link is slow to respond, please be patient (ready=0)
    [ 663.851604] ata1: COMRESET failed (errno=-16)
    [ 663.851610] ata1: hard resetting link
    [ 669.186591] ata1: link is slow to respond, please be patient (ready=0)
    [ 673.881456] ata1: COMRESET failed (errno=-16)
    [ 673.881462] ata1: hard resetting link
    [ 679.216481] ata1: link is slow to respond, please be patient (ready=0)
    [ 702.743982] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    [ 703.012578] ata1.00: configured for UDMA/100
    [ 703.012584] ata1.00: device reported invalid CHS sector 0
    [ 703.012599] ata1: EH complete
    [ 714.097642] systemd[1]: systemd-journald.service watchdog timeout (limit 1min)!
    [ 742.443488] sd 0:0:0:0: [sda] tag#18 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x06
    [ 742.443494] sd 0:0:0:0: [sda] tag#18 CDB: opcode=0x2a 2a 00 28 c3 c6 40 00 00 10 00
    [ 742.443497] blk_update_request: I/O error, dev sda, sector 683918912
    [ 742.443503] EXT4-fs warning (device sda8): ext4_end_bio:317: I/O error -5 writing to inode 20322020 (offset 0 size 0 starting block 85489866)
    [ 742.443506] Buffer I/O error on device sda8, logical block 9323208
    [ 742.443508] Buffer I/O error on device sda8, logical block 9323209
    [ 742.443515] sd 0:0:0:0: [sda] tag#19 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x06
    [ 742.443518] sd 0:0:0:0: [sda] tag#19 CDB: opcode=0x2a 2a 00 28 c3 c6 80 00 00 10 00
    [ 742.443520] blk_update_request: I/O error, dev sda, sector 683918976
    [ 742.443522] EXT4-fs warning (device sda8): ext4_end_bio:317: I/O error -5 writing to inode 20322020 (offset 0 size 0 starting block 85489874)
    [ 742.443524] Buffer I/O error on device sda8, logical block 9323216
    [ 742.443526] Buffer I/O error on device sda8, logical block 9323217
    [ 742.443531] sd 0:0:0:0: [sda] tag#20 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x06
    [ 742.443534] sd 0:0:0:0: [sda] tag#20 CDB: opcode=0x2a 2a 00 28 c3 c6 d0 00 00 10 00
    [ 742.443536] blk_update_request: I/O error, dev sda, sector 683919056
    [ 742.443538] EXT4-fs warning (device sda8): ext4_end_bio:317: I/O error -5 writing to inode 20322020 (offset 0 size 0 starting block 85489884)
    [ 742.443540] Buffer I/O error on device sda8, logical block 9323226
    [ 742.443542] Buffer I/O error on device sda8, logical block 9323227
    [ 742.443547] sd 0:0:0:0: [sda] tag#21 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x06
    [ 742.443549] sd 0:0:0:0: [sda] tag#21 CDB: opcode=0x2a 2a 00 28 c3 c7 10 00 00 10 00
    [ 742.443551] blk_update_request: I/O error, dev sda, sector 683919120
    [ 742.443553] EXT4-fs warning (device sda8): ext4_end_bio:317: I/O error -5 writing to inode 20322020 (offset 0 size 0 starting block 85489892)
    [ 742.443555] Buffer I/O error on device sda8, logical block 9323234
    [ 742.443557] Buffer I/O error on device sda8, logical block 9323235
    [ 756.187685] systemd[1]: systemd-journald.service: main process exited, code=dumped, status=6/ABRT
    [ 756.187986] systemd[1]: Unit systemd-journald.service entered failed state.
    [ 756.188116] systemd[1]: systemd-journald.service failed.
    [ 756.188474] systemd[1]: systemd-journald.service has no holdoff time, scheduling restart.
    [ 756.189106] systemd[1]: Stopping Flush Journal to Persistent Storage...
    [ 756.189143] systemd[1]: Listening on Journal Audit Socket.
    [ 756.189801] systemd[1]: Starting Journal Service...
    [ 757.525493] systemd-coredump[1038]: Detected coredump of the journal daemon itself, diverted to /var/lib/systemd/coredump/core.systemd-journal.0.b8610e85f9074a418534aaee0adbac56.141.1430763073000000.lz4.
    [ 758.133944] systemd-journald[1050]: File /var/log/journal/f646626ba4b647f48501020bf12ca33b/system.journal corrupted or uncleanly shut down, renaming and replacing.
    [ 758.503041] systemd[1]: Started Journal Service.
    [ 759.180771] systemd-journald[1050]: File /var/log/journal/f646626ba4b647f48501020bf12ca33b/user-1000.journal corrupted or uncleanly shut down, renaming and replacing.
    [ 974.867721] ata1.00: exception Emask 0x0 SAct 0x3f80 SErr 0x0 action 0x6 frozen
    [ 974.867732] ata1.00: failed command: WRITE FPDMA QUEUED
    [ 974.867742] ata1.00: cmd 61/08:38:68:d3:c5/00:00:1a:00:00/40 tag 7 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    [ 974.867747] ata1.00: status: { DRDY }
    [ 974.867751] ata1.00: failed command: WRITE FPDMA QUEUED
    [ 974.867759] ata1.00: cmd 61/08:40:88:d3:c5/00:00:1a:00:00/40 tag 8 ncq 4096 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    [ 974.867763] ata1.00: status: { DRDY }
    [ 974.867767] ata1.00: failed command: WRITE FPDMA QUEUED
    [ 974.867774] ata1.00: cmd 61/08:48:a0:d3:c5/00:00:1a:00:00/40 tag 9 ncq 4096 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    [ 974.867778] ata1.00: status: { DRDY }
    [ 974.867781] ata1.00: failed command: WRITE FPDMA QUEUED
    [ 974.867789] ata1.00: cmd 61/20:50:c0:d3:c5/00:00:1a:00:00/40 tag 10 ncq 16384 out
    res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    [ 974.867793] ata1.00: status: { DRDY }
    [ 974.867796] ata1.00: failed command: WRITE FPDMA QUEUED
    [ 974.867803] ata1.00: cmd 61/10:58:f0:d3:c5/00:00:1a:00:00/40 tag 11 ncq 8192 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    [ 974.867807] ata1.00: status: { DRDY }
    [ 974.867810] ata1.00: failed command: WRITE FPDMA QUEUED
    [ 974.867817] ata1.00: cmd 61/08:60:10:d4:c5/00:00:1a:00:00/40 tag 12 ncq 4096 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    [ 974.867821] ata1.00: status: { DRDY }
    [ 974.867824] ata1.00: failed command: WRITE FPDMA QUEUED
    [ 974.867831] ata1.00: cmd 61/18:68:28:d4:c5/00:00:1a:00:00/40 tag 13 ncq 12288 out
    res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    [ 974.867835] ata1.00: status: { DRDY }
    [ 974.867841] ata1: hard resetting link
    [ 980.202774] ata1: link is slow to respond, please be patient (ready=0)
    [ 984.900902] ata1: COMRESET failed (errno=-16)
    [ 984.900908] ata1: hard resetting link
    [ 990.236024] ata1: link is slow to respond, please be patient (ready=0)
    [ 994.930829] ata1: COMRESET failed (errno=-16)
    [ 994.930836] ata1: hard resetting link
    [ 996.798104] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
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    [ 997.014023] ata1.00: device reported invalid CHS sector 0
    [ 997.014025] ata1.00: device reported invalid CHS sector 0
    [ 997.014026] ata1.00: device reported invalid CHS sector 0
    [ 997.014028] ata1.00: device reported invalid CHS sector 0
    [ 997.014030] ata1.00: device reported invalid CHS sector 0
    [ 997.014031] ata1.00: device reported invalid CHS sector 0
    [ 997.014065] ata1: EH complete
    There are some sda8 (home) related messages. I also found these messages first time Arch was installed (i think also related to home partition).
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