Ok, we had a long thread about this before. I for one, was unaware that the SD cards have internal circuits to implement write leveling, so you should not use a flash file system on them. You can even use FAT, ext2, ext3. There is some argument about whether or not it is good to use a journaling file system, since it will result in more writes. No matter what you do, if you disconnect power at the exact time of a write, you will end up adding to the bad blocks.
Well, search the archives for the last long thread about flash file systems.
Hope that helps, Don.
On 12/6/06, sipnj <> wrote:
Sometimes the simple things escape me.
I am asking if anyone has converted their SD card to JFFS2 designed
for embedded systems. There may be a down side in using it and wanted
to know.
http://sourceware.org/jffs2/
--- In ts-7000%40yahoogroups.com, "Alvaro Aguirre" <>
wrote:
>
> There's always a image of the original system on embeddedarm.com. if you
> need to backup your own disc, shutdown the board, remove the SD
card, plug
> it to your linux PC, dd if=/dev/sda of=image.img
> The SD has three different partitions, not just a ext2 partition,
you can
> check it with fdisk.
>
> Why not JFFS2? I miss that post :(... anyone?
>
> On 12/5/06, sipnj <> wrote:
> >
> > I would like to backup the full 256 MD SD to my Linux laptop
before I
> > start making changes to it? I can SSH into it and have sftp access,
> > but I am not sure how to make an exact image. Do I use DD?
> >
> > Also, I noticed that the SD its formatted as ext2. Why isn't it
> > formatted as JFFS2?
> >
> > Thanks
> >
> >
> >
>
-- Dr. Don W. Carr J. G. Montenegro 2258 Guadalajara, Mexico +52-333-630-0704 +52-333-836-4500 ext 2930
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