On Sat, Oct 10, 2009 at 11:26 AM, Mitch Bradley w...@laptop.org wrote:
You can get the erase block size from SD cards - it's in the Card
Specific Data structure - but I don't know of any standard way to get it
for USB mass storage devices.
Interesting! Did a bit of looking around but can't
On Sat, Oct 10, 2009 at 02:46:17AM +0100, Martin Dengler wrote:
Nope (SoaS) - that'll waste your partition table in favour of whatever
I copied from my dsd-inspired make-fake-device partition table
script[1]. I'd love patches.
From that script:
NUM_HEADS=16
NUM_SECTORS_PER_TRACK=62
That
You can get the erase block size from SD cards - it's in the Card
Specific Data structure - but I don't know of any standard way to get it
for USB mass storage devices.
Sascha Silbe wrote:
On Sat, Oct 10, 2009 at 02:46:17AM +0100, Martin Dengler wrote:
Nope (SoaS) - that'll waste your
On Tue, Oct 6, 2009 at 3:10 AM, Mitch Bradley w...@laptop.org wrote:
b) If you must construct a fixed partition layout for use on multiple
different devices, align each partition on at least a 4MiB boundary.
That means that you waste 4M for the partition map (one 512-byte
sector padded out to
OCZ Rally 2 4GB has worked fine for me for a year now. If you go for
the OCZ Rally 2 Turbo, it has higher random write speeds(faster boot,
opening apps) but I'm not sure about reliabilty. OCZ has a good
reputation for good reliability on most of it's products.
Using an USB-SD adapter with one of
On Fri, Oct 09, 2009 at 04:23:17PM -0700, S Page wrote:
On Tue, Oct 6, 2009 at 3:10 AM, Mitch Bradley w...@laptop.org wrote:
b) If you must construct a fixed partition layout for use on multiple
different devices, align each partition on at least a 4MiB boundary.
That means that you waste
Coincident with the industry-wide change to managed Flash is the change
to smaller transistors and storing multiple data bits per cell (MLC,
vs. SLC or
single bit per cell). This has brought a huge increase in error
rates, and a
decrease in reliability and erase cycle lifetime.
The bad news
On Tue, Oct 6, 2009 at 12:07 AM, Mitch Bradley w...@laptop.org wrote:
time, I expect the situation to get better and better as the firmware
that gets it right supplants the earlier tries.
It's reassuring to hear that at least someone with your understanding
of HW (and the industry around it)
Trying to find datasheets of the flash chips to know what their erase
block size and page size(and number of erase cycles) has been a
nightmare for me, the manufacturer just doesn't care if your
partitioning choice ends up sending the SSD/SD/MMC sooner than the
warranty expires.
Have you had the
Martin Langhoff wrote:
On Tue, Oct 6, 2009 at 12:07 AM, Mitch Bradley w...@laptop.org wrote:
time, I expect the situation to get better and better as the firmware
that gets it right supplants the earlier tries.
It's reassuring to hear that at least someone with your understanding
Tiago Marques wrote:
Trying to find datasheets of the flash chips to know what their erase
block size and page size(and number of erase cycles) has been a
nightmare for me, the manufacturer just doesn't care if your
partitioning choice ends up sending the SSD/SD/MMC sooner than the
warranty
On Tue, Oct 6, 2009 at 11:27 AM, Mitch Bradley w...@laptop.org wrote:
To solve a hard problem to the level where you can ship the result
requires money
Not particularly controversial with me at least. The community is made
of many interests, and the commercial interests are a significant
part.
Martin Langhoff wrote:
On Tue, Oct 6, 2009 at 11:27 AM, Mitch Bradley w...@laptop.org wrote:
To solve a hard problem to the level where you can ship the result
requires money
Not particularly controversial with me at least. The community is made
of many interests, and the
On Tue, Oct 6, 2009 at 12:43 PM, Mitch Bradley w...@laptop.org wrote:
The raw-access device will not be cheaper, because any possible (small)
savings in silicon area will be overwhelmed by the lower-volume factor. The
managed-NAND solution will lock in.
Yes, that's what usually happens, and
-- Forwarded message --
From: Tiago Marques tiago...@gmail.com
Date: Tue, Oct 6, 2009 at 1:26 PM
Subject: Re: Woodhouse on flash storage
To: Mitch Bradley w...@laptop.org
On Tue, Oct 6, 2009 at 11:10 AM, Mitch Bradley w...@laptop.org wrote:
Tiago Marques wrote:
Trying to find
On Sun, Oct 04, 2009 at 01:59:29PM -0400, Chris Ball wrote:
http://www.advogato.org/person/dwmw2/diary/211.html
Thanks for the links - it's nice to keep up with what's going on in
the flash-expert world.
How might the outcome of these debates affect the use of the microSD
internal storage on
Hi Martin,
How might the outcome of these debates affect the use of the
microSD internal storage on the XO-1.5?
I don't think there's much we can use Dave's advice for given the
choice of microSD. If a microSD card that had a passthrough mode
to access the raw flash existed, his
On Mon, Oct 5, 2009 at 5:27 PM, Chris Ball c...@laptop.org wrote:
I don't think there's much we can use Dave's advice for given the
choice of microSD. If a microSD card that had a passthrough mode
to access the raw flash existed, his argument would be that we
should consider using that mode.
On Mon, Oct 5, 2009 at 4:44 PM, Martin Langhoff
martin.langh...@gmail.com wrote:
On Mon, Oct 5, 2009 at 5:27 PM, Chris Ball c...@laptop.org wrote:
I don't think there's much we can use Dave's advice for given the
choice of microSD. If a microSD card that had a passthrough mode
to access the
On Oct 5, 2009, at 11:56 AM, Peter Robinson wrote:
On Mon, Oct 5, 2009 at 4:44 PM, Martin Langhoff
martin.langh...@gmail.com wrote:
On Mon, Oct 5, 2009 at 5:27 PM, Chris Ball c...@laptop.org wrote:
I don't think there's much we can use Dave's advice for given the
choice of microSD.
The fact
Hi,
http://www.advogato.org/person/dwmw2/diary/211.html
Ah, and now cscott has written a post in reply:
http://cananian.livejournal.com/58238.html
- Chris, your personal RSS reader.
--
Chris Ball c...@laptop.org
One Laptop Per Child
___
Devel
David might be right in principle, but when component price matters, you
have to buy the hardware that the mass market offers. Right now the
sweet spot is smart devices with embedded Flash Translation Layer
firmware. I'd place my bet on that trend continuing.
Linux does not drive the mass
http://www.advogato.org/person/dwmw2/diary/211.html
--
Chris Ball c...@laptop.org
One Laptop Per Child
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