Re: Read errors on Flash Drive Transcend TS1GJF2A

On Sat, 25 Aug 2007, RTE wrote:

> > Do you encounter actual read errors (that is, error messages in the
> > system log), or do you find that the reads appear to succeed but return
> > incorrect data?
> Yes, the reads succeed but return incorrect data
> 
> > If you write data under 2.6.22 and then read it back with 2.6.17, does
> > it come out okay?
> Yes, it does.
> 
> > If you read the same data back multiple times under 2.6.22, do the same
> > CRC/MD5 errors occur each time?  Or do you get a different set of
> > mismatches?
> Each time I get different md5-s
> 
> > Have you tried running the intermediate development testing kernels
> > between 2.6.17 and 2.6.18?  For example, what happens with 2.6.18-rc1?
> 2.6.17.14 - works fine
> 2.6.18-rc1 - same as 2.6.18 (incorrect data)

How about the various kernels between 2.6.17 and 2.6.18-rc1: 
2.6.17-git1 through 2.6.17-git9?  You can find the various sources, 
patches, and incremental patches under

	http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/old/

> Data is not all incorrect in files copied from the Flash Drive. It only contains some set of random error blocks.
> For a simple example, a movie-file (mp4, xVid) plays well (not on every players), but some frames is "broken".
> The size of a file does not change.

So you're getting occasional data errors in your reads.  Hopefully you 
will be able to pin down the exact change which caused this.

Alan Stern


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