Re: sdcard for /opt and /library on xo 1.5

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Re: sdcard for /opt and /library on xo 1.5

James Cameron-2
Not really, and no.

XO-1.5 is no longer in production.

We still apply a similar qualification process to the eMMC chips
soldered into XO-1.75 and XO-4.  We take a batch (e.g. 1000), randomly
pick a sample (e.g. 20), test that sample for compatibility, change
firmware if necessary, test for endurance, and measure the change in
performance.

Our qualification process is not cost effective for end users; you
are better off sourcing six cards from different origins, and subject
them to tests, in order to use one of them in the final use.  The rest
can be sold second-hand or repurposed.

(-CC support-gang@, as it is a closed list)

On Wed, Jul 15, 2015 at 11:20:18PM -0400, Nathan C. Riddle wrote:

> James,
>
> Would you expand on your past comments about the SD cards in the
> X-1.5 having been specially "qualified" and such replacements not
> being readily available to end users ?
> That is, have you accumulated any info that may guide selecting
> suitable replacements from more advanced cards now now available to
> XO-1.5 end users ?
> NCR
>
>
> On Wed, Jul 15, 2015 at 10:31 PM, James Cameron wrote:
>
> >On Wed, Jul 15, 2015 at 09:27:49AM -0400, Tim Moody wrote:
> >>
> >>
> >>>-----Original Message-----
> >>>From: Jerry Vonau [mailto:[hidden email]]
> >>>Sent: Wednesday, July 15, 2015 3:56 AM
> >>>To: [hidden email]; Tim Moody
> >>>Cc: [hidden email]; [hidden email]
> >>>Subject: RE: [XSCE] sdcard for /opt and /library on xo 1.5
> >>>
> >>>
> >>>
> >>>>On July 14, 2015 at 10:49 PM Tim Moody <[hidden email]> wrote:
> >>>>
> >>>>
> >>>>I think the bottom line is that on this xo1.5 I need to use a usb
> >>>>thumb drive instead of this micro sdcard and its holder.
> >>>>
> >>>
> >>>For what it's worth I've never had much luck using micro/SD
> >>>adapters in general.  If I recall correctly the 1.5's internal
> >>>micro card is held in a replaceable holder, might be just plain
> >>>easier to replace that one with the larger card and not have the
> >>>filesystem dangling out the side of the XO. ;) The XO's image file
> >>>will resize to fit the larger card but you'd have skip the custom
> >>>partitioning
> >>
> >>Very interesting idea.  James?
> >
> >Me?  It will void your warranty.  Oh, wait.  Already out of warranty.
> >;-)
> >
> >Yes, the XO-1.5 internal storage is microSD card in a cage, accessible
> >after disassembly of back panel.
> >
> >http://wiki.laptop.org/go/Disassembly
> >http://wiki.laptop.org/go/Disassembly_top
> >
> >Test the microSD card in the SD slot first; to make sure firmware can
> >operate with it.  No point if that won't work.
> >
> >http://wiki.laptop.org/images/f/f0/XO_1.5_B1_Annotated_Motherboard.png
> >
> >In that image, the cage is in locked position.  Record what you find,
> >especially the length of the card exposed to the right of the shiny
> >metal.
> >
> >Failing to lock it afterwards will cause unpredictable behaviour;
> >thermal cycles and vibration may set the card adrift in the case.
> >
> >To unlock, push the cage to the right with a force parallel to the
> >board.
> >
> >To open, lift the left edge.
> >
> >Remove and replace the card.  (Continue to use ESD precautions on
> >these microSD cards, they are vulnerable).
> >
> >Lower the left edge then push the cage to the left, with a force
> >parallel to the board, until (a) you have felt a click, and (b) you
> >see the same exposed width of the card.
> >
> >Then with the system still disassembled, try an fs-update, and then
> >try booting at least ten times.
> >
> >Yes, the filesystem should resize on first boot.  13.2.5 will quickly
> >resize to 16 GB, but beyond that it will take quite some time.  Use
> >the tick (check) key on first boot and watch the storage indicator so
> >you can tell what it is doing.
> >
> >--
> >James Cameron
> >http://quozl.linux.org.au/

--
James Cameron
http://quozl.linux.org.au/
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