Also, make sure your BIOS is the latest version for your motherboard!
Jay
>
>>
>> [ 2.183682] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>> [ 2.183825] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
>> [ 7.183893] ata3.00: qc timeout (cmd 0xec)
>> [ 7.183908] ata3.00: failed to IDENTIFY (I/O error, err_mask=0x4)
>> [ 7.183960] ata4.00: qc timeout (cmd 0xa1)
>> [ 7.183974] ata4.00: failed to IDENTIFY (I/O error, err_mask=0x4)
>> [ 7.488894] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
>> [ 7.488931] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>> [ 17.488919] ata3.00: qc timeout (cmd 0xec)
>> [ 17.488934] ata3.00: failed to IDENTIFY (I/O error, err_mask=0x4)
>> [ 17.488942] ata3: limiting SATA link speed to 3.0 Gbps
>> [ 17.488964] ata4.00: qc timeout (cmd 0xa1)
>> [ 17.488979] ata4.00: failed to IDENTIFY (I/O error, err_mask=0x4)
>> [ 17.793923] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
>> [ 17.794894] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>> [ 47.794008] ata3.00: qc timeout (cmd 0xec)
>> [ 47.794023] ata3.00: failed to IDENTIFY (I/O error, err_mask=0x4)
>> [ 47.794880] ata4.00: qc timeout (cmd 0xa1)
>> [ 47.794897] ata4.00: failed to IDENTIFY (I/O error, err_mask=0x4)
>> [ 48.099012] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
>> [ 48.099884] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>
> So lots of errors there - the "failed to IDENTIFY" means there is
> something present but it's not responding to the commands. These sorts
> of things are almost always down to the SATA BIOS settings or buggy
> SATA hardware. Make sure the BIOS has the SATA settings as AHCI and if
> that doesn't improve things then set "noapic" and/or "acpi=off" on the
> kernel command line.
>
> Googling for "qc timeout (cmd 0xec)" gives lots of hits.
>
> Be warned though, changing the SATA BIOS settings may have an adverse
> affect on the Windows install - it may fail to recognise your disks.
>
> P.
>
>
>
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