md5sum command calculate different code for the same file

[Birol Bora]

I'm using Ubuntu 11.10
When I execute md5sum command its calculate different code for the same file

birol@trax:~/Downloads$ uname -a
Linux trax 3.0.0-16-generic #28-Ubuntu SMP Fri Jan 27 17:44:39 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

birol@trax:~/Downloads$ ls -l v1.img
-rw-rw-r-- 1 birol birol 1796509184 2012-03-15 01:36 v1.img

birol@trax:~/Downloads$ md5sum v1.img
e8a2c652770a2da0fd93c981a79a8ba1 v1.img
birol@trax:~/Downloads$ md5sum -b v1.img
d692965aa21d43b40e7c6e821f721159 *v1.img
birol@trax:~/Downloads$ md5sum v1.img
baa9389d2ecfecf8d405a22565d1565b v1.img
birol@trax:~/Downloads$ md5sum v1.img
e683b1e5bba99dee3ecd35765f0fc368 v1.img
birol@trax:~/Downloads$ md5sum v1.img
ee0d31564b0a0508e83766c31fc18236 v1.img
birol@trax:~/Downloads$ md5sum v1.img
0c821ea3600f13c5b9d14fc12f329773 v1.img

birol@trax:~/Downloads$ ls -l v1.img
-rw-rw-r-- 1 birol birol 1796509184 2012-03-15 01:36 v1.img

[Jim Meyering (meyering)]

Birol Bora wrote:
> Public bug reported:
>
> I'm using Ubuntu 11.10
> When I execute md5sum command its calculate different code for the same file
>
> birol@trax:~/Downloads$ uname -a
> Linux trax 3.0.0-16-generic #28-Ubuntu SMP Fri Jan 27 17:44:39 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
>
> birol@trax:~/Downloads$ ls -l v1.img
> -rw-rw-r-- 1 birol birol 1796509184 2012-03-15 01:36 v1.img
>
> birol@trax:~/Downloads$ md5sum v1.img
> e8a2c652770a2da0fd93c981a79a8ba1 v1.img
> birol@trax:~/Downloads$ md5sum -b v1.img
> d692965aa21d43b40e7c6e821f721159 *v1.img
> birol@trax:~/Downloads$ md5sum v1.img
> baa9389d2ecfecf8d405a22565d1565b v1.img
> birol@trax:~/Downloads$ md5sum v1.img
> e683b1e5bba99dee3ecd35765f0fc368 v1.img
> birol@trax:~/Downloads$ md5sum v1.img
> ee0d31564b0a0508e83766c31fc18236 v1.img
> birol@trax:~/Downloads$ md5sum v1.img
> 0c821ea3600f13c5b9d14fc12f329773 v1.img
>
> birol@trax:~/Downloads$ ls -l v1.img
> -rw-rw-r-- 1 birol birol 1796509184 2012-03-15 01:36 v1.img

Thanks for the report.
I've seen this sort of problem a couple of times.
So far, every time it has been due to faulty hardware.

To cross-check try running the openssl command:

    openssl md5 v1.img

[Birol Bora (bora-birol)]

Thank you Jim,

I check openssl md5 v1.img command , everytime i see different checksums.
I remove Ubuntu OS, install another stable Linux Distribution with partition again default install options but problem still continues.

md5sum works well, if file size less then 256 MB.

I think the Corsair Force 3 SSD 60 GB(Firmware 1.3) is causing the problem or SSD partition alignment problem.
How to make SSD compatible stable partition aligment ?
How to solve problem ?

[Birol Bora (bora-birol)]

The problem is being caused by faulty memory. I scanned the memory with a memory test tools. I've found a memory card is defective and replaced with a new one. Problem solved.

[Jim Meyering (meyering)]

Birol Bora wrote:
> The problem is being caused by faulty memory. I scanned the memory with
> a memory test tools. I've found a memory card is defective and replaced
> with a new one. Problem solved.
>
> ** Changed in: coreutils (Ubuntu)
> Status: New => Invalid

Thanks for letting us know.