[GRLUG] So I have this laptop...

[Clay Ashby]

Awesome information!

Thx Michael

--Sent from my android.
On May 4, 2011 6:13 PM, "Michael Mol" <mikemol at gmail.com> wrote:
> On Wed, May 4, 2011 at 9:15 PM, Mike Williams <knightperson at zuzax.com>
wrote:
>> It's a Toshiba Satellite A305-S6872. The laptop chassis has two hard
drive
>> bays, but only one of them has a connector in it. There are solder points
>> for a hard drive connector in the second bay, but I can't tell if they're
>> hooked up to anything. Theoretically, it would be possible to solder
another
>> port into that bay and give me the option of a second hard drive, but I
>> don't know if the solder points require another chip or something. Is
there
>> any way in Linux (Ubuntu 10.10 64-bit if it matters) to look in /proc and
>> see if the SATA controller can handle another device?
>
> Here's how I just figured out where my system sits for this kind of thing:
>
> Q: What's the name of a device that sits on the controller I'm interested
in?
> A: /dev/sr0
>
> cd /sys
>
> find . -name 'sr0'
>
> I see that sr0 exists at
> ./devices/pci0000:00/0000:00:11.0/host2/target2:0:0/2:0:0:0/block/sr0
>
> What that means:
> /sys/devices is branch under /sys that organizes devices by how
> they're tied in, physically.
>
> /sys/devices/pci0000:00 is the folder specific to the first PCI bus on
> the system. (You can have multiple PCI busses in a system. Most
> systems do, actually, and PCI Express busses look logically like PCI
> busses)
>
> /sys/devices/pci0000:00/0000:00:11.0 is the folder specific to a
> particular PCI device and subdevice. (A PCI device can have multiple
> components on it. For example, one of my old video cards had its VGA
> output as one device, and its SVideo output as another device.) In
> this case, the PCI device is my SATA controller.
>
> I can verify that it's my SATA controller by running lspci, and seeing
> this line:
> 00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA
> Controller [AHCI mode]
>
> SATA seems to be organized as SCSI is, with each link its own logical
> bus. My /dev/sr0 sits at host2/target2:0:0/2:0:0:0. I *think* that
> means it sits on the second bus of the device, with a LUN of 2:0:0 (or
> 2:0:0:0, not sure).
>
> If I take a look at the directory for the controller itself, though,
> /sys/devices/pci0000:00/0000:00:11.0 , I can look and see what the
> controller indicates it supports.
>
> Running 'ls' in that folder, I see that I have six "host" directories,
> host0, host1, host2, host3, host4 and host5.
>
> Looking at my motherboard, I can see that while I have six SATA ports,
> I only have five devices plugged in, so I can see all SATA ports, not
> just the active ones.
>
> I don't have any unsoldered SATA headers, but my advice would be to
> look in the /sys/devices/... directory for your SATA controller, and
> see if the number of 'hostN' entries in that folder is greater than
> the number of in-use connectors.
>
> --
> :wq
>
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