[Elphel-support] the problems from the hdd (in short)

[Andrey Filippov]

Sebastian,

4096 byte blocks are not the problem in the 353 cameras - they all now have
this block size. Please see our Development Blog post on that matter:
http://blog.elphel.com/2010/11/elphel-cameras-and-4096-4k-sector-drives/

And the disk was correctly formatted and tested _in the camera_ (not in the
external computer) - it is not a good idea to try to remove it - the flex
cable is not so easy to handle if you do not have such experience already.
I believe Carlos should continue to follow Oleg's instructions - it was he
who formatted and tested the HDD in the camera

Andrey

On Fri, Feb 3, 2012 at 8:48 AM, Sebastian Pichelhofer <
sebastian.pichelhofer at gmail.com> wrote:

> On Fri, Feb 3, 2012 at 16:44, Carlos Padial <palidoestudio2 at gmail.com>
> wrote:
> >> OK so do I understand this correctly that the new 4K block size of
> >> newer harddisks is the problem:
> >> http://en.wikipedia.org/wiki/Disk_sector ?
> >
> > dont know, but this you say remember me something readed about this
> > digging in the list archive. But i dont fully understand if it was the
> > same case. it was about using ext3... and my disk was formated as
> > ext2... (i believe)
> >
> >> Since the embedded linux in the 353 camera is already several years
> >> old it could well be the case that it has problems with 4K sectors.
> >
> >> Carlos, one idea: Could you prepare the HDD and the partition tables
> >> on a PC and then see if the camera can talk to it nicely.
> > i am afraid i dont have this kind of conexion for this, i will look
> > for an adapter...
> > what kind of hardware i need for this?
>
> The SATA port on the camera is the very same connector as in any normal PC.
> If you only have a laptop you can use any external HDD (eg. USB2)
> enclosure.
>
> Regards Sebastian
>
> >
> >> I do think we should put a notice on the wiki about the 4K sector
> >> problem once we have a full understanding, and probably recommend
> >> customers to not use/or use with caution 4K HDDs for now.
> >
> > Yes, i think this shoud be done. But i have not full understanding of
> > the problem yet.
> >
> > So there is no other way?
> >
> > Thanks oleg and sebastian for your support.
> >
> >> Regards Sebastian
> >>
> >> On Fri, Feb 3, 2012 at 14:28, Carlos Padial <palidoestudio2 at gmail.com>
> wrote:
> >>> Thanks to oleg who kindly help me a lot yesterday, we have narrow down
> >>> the problem to this one:
> >>>
> >>> # fdisk -l
> >>>
> >>> Note: sector size is 4096 (not 512)
> >>>
> >>> Disk /dev/hda: 120.0 GB, 120034123776 bytes
> >>> 255 heads, 63 sectors/track, 1824 cylinders
> >>> Units = cylinders of 16065 * 4096 = 65802240 bytes
> >>>
> >>> Disk /dev/hda doesn't contain a valid partition table
> >>>
> >>> So i need to make a new partition table.
> >>> I found about fix tables with cfdisk but seems its not installed
> >>> With the -o option in fdisk the changes seems not  to be applied at
> all...
> >>>
> >>> someone knows how to proceed?
> >>>
> >>> best regards.
> >>> --
> >>> Carlos Padial
> >>> surreal.asturnazari.es
> >
> >
> >
> > --
> > Carlos Padial
> > surreal.asturnazari.es
>
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