Re: Rootfs on sheevaplug without killing my sd cards / usb sticks

[Karsten König <remur@gmx.net>]

I'll awnser all in one here

harddrive is a no go, don't want it running all the time, it's only for 
backups

the reduced writes (no atime, ext2, etc) are already active though I need to 
set a higher "block io" time so it will gather more data to write at once

the card was a class 10 4gb sd card from sansa, as it cost 25 € i thought it'd 
be decent =/


Am Freitag, 26. März 2010 12:01:40 schrieb Teis Dreijer:
> I'd suggest you keep away from MLC memory and stick with SLC. As its
> easier to tell the difference between states with only two states, it
> should last longer before encountering problems with reading data.

I can't see that from the outside right? Is the internal flash slc?

> Are you sure the card is actually worn down? I'd think it should be good
> for another run once data is written to it again. *If* the problem is
> that the controller cannot tell the difference with multiple bits being
> stored on each cell.

Yes, I formatted it and copied the old system over, took ages, especially 
unmounting took multiple minutes so I guess the write queue was still packed 
full and hard to really get onto the sd


I guess I just hit a really bad sd card, I'll attempt another go with using 
ubifs and the nand flash of the sheeva plug

thanks alot everybody!
Karsten



> On Fri, 2010-03-26 at 10:51 +0100, Diego Roversi wrote:
> > On Mon, Mar 22, 2010 at 01:43:21AM +0100, Karsten König wrote:
> > > Heya,
> > > 
> > > I ruined 1 expensive sd card and two usb flash sticks already with a
> > > basic debian system, even though /var is already on a seperate stick,
> > > I don't want to dive into it too much to find out what process is
> > > responsible.
> > 
> > Looks like recent flash memory quality, expecialy budget one, is became
> > worse and worse. I have a small system (lart) running on 1Gb CF with
> > debian, and the CF is 4 years old and still working fine. I recently
> > replaced with a 4Gb CF, but starts to get corrupted after few month. So
> > i decide to continue to use the old CF.
> > 
> > I had similar experience with varius kind of removable flash memory (usb,
> > sd) and usually recent and high capacity have more wearing problems.
> > 
> > Regards,
> > 
> >   Diego.