CRC32 , MD5 , SHA - 1 Curiosity

[Kyon]

i playing a game yesterday and i saw a blue screen , my windows crashed and restarted . i think it is a software problem . i have very important files in my harddisk . i dont know that maybe they are corrupted . i checked them with crc32 , md5 and sha - 1 methods . it seems very good . but some peoples said to me " i have some file corrupted but crcs same " huh it is possible ? i had this very big problem please help me

[lilalurl]

The first step would be to do a scandisk/chkdsk with the 'find bad clusters/sectors' option on (if you access it by right clicking on your drive -> properties -> tools, tick both options).

[Kyon]

I do it . i saw any bad sectors

[lilalurl]

Originally Posted by Kyon

I do it . i saw any bad sectors

Sorry to say so, but that sentence does not make any sense.

Did you see bad sectors or did you not see any bad sectors? Or did you mistype 'any' instead of 'many'?

[Kyon]

i not see any bad sectors

[Kyon]

I need help

[hit]

chkdsk was mention already, did you made such scan? have alook here: http://support.microsoft.com/kb/315265
depending on which volumes you have, try "chkdsk volume:/c" in a command window. since "c" will be busy, you have to reboot and the system should start the chkdsk while rebooting.
if there are other volumes too, let them check the same way.

if there are archives of any kind (.zip .rar, etc) just use winrar and "test" them.

[lilalurl]

Also, I'd recommend you try and make a copy of those 'important' files:
1) It will be a backup in case there is really a problem and things get worse
2) It could help reveal a hard drive problem if Windows has a problem accessing one of the files during copy

You should also do what hit said. If you did the chkdsk by clicking on the drive it could be that some system files were locked up during the test because used by windows.
I don't know if windows reports directly the bad sectors with a message, so maybe you should check the event viewer (type eventvwr in the run dialog). The chkdsk reports are stored there (system section I think. If not, it is the application section).


Perhaps, although it is very unlikely, one file got corrupted if you were working and writing on it when the BSOD happened.
Otherwise, there could be no problem if you don't notice something weird.

[Kyon]

My question is not that i asking crc32 and others

[hit]

Originally Posted by Kyon

My question is not that i asking crc32 and others

hmm, so did you made a list with your files and their checksums and now, after the crash, you want compare them?

[Toni Wilen]

I wouldn't trust CRC32 but MD5 and SHA1 collisions are really-really-extremely rare.

[Kyon]

Yes i compared it this three technique and checksums are same . but some peoples says crc32 suck . but others have mistakes ?

[Kyon]

Who know that ?

[hit]

Originally Posted by Kyon

Who know that ?

if you had successfully compared the files with your existing checksums, i'd say things are ok. if CRCs and filesystem doesnt show any failures, then i wouldn't bother any further.
but i would suggest a backup of the very important files, if you have another HDD, then consider a backup.

[Kyon]

I checked it correctly and i backup my important files but it is a suddenly crash

[Kyon]

i attached my dump file but i dont understand it
what is my computers problem ?

[Rabbit80]

Looks like a driver crash to me... Have you installed any new devices or updated drivers lately? Try updating your video drivers!

[Kyon]

I tried it but same result

[Supamax]

Originally Posted by Toni Wilen

I wouldn't trust CRC32

Hi Toni,
what do you mean...? Two files may have the same CRC32 and have some bit/bytes different??
I always thought CRC32 to be sure! If not, when, where and why?

[Kyon]

I am confused