how to detect file corruption

[x_kzy_xd]

Sometimes, my files become corrupted without me noticing - this happens to my photos a lot. This doesn't bother me when I notice it because I have backups. It's growing to be a pain to manually go over all the photos from time to time. What can I do to automatically detect if a file has been corrupted?

So far, the only method I have found is to use MD5 checksums. But I haven't found a way to automate this.

For example, if I have a folder with 500 pictures, how I do determine if the MD5 checksums for the photos have changed since last time I checked?

 

[Ken g6]

I <3 ImageMagick.

for %i in (*.jpg) do @convert %i bmp:NUL

That will attempt to convert every JPEG into a simple bitmap, then discard that bitmap. If it finds problems it should alert you. Of course if you want that in a batch file, use "%%i" instead of "%i".

 

[Cerb]

I'm lazy and put my WORM backups into archives for CRCs , but look for "sfv" (simple file verification) software. SFV Ninja seems to be somewhat popular.

I really wish someone would make a nice GUI for PAR2 that handles subdirectories, though: two birds with one stone and all that.

 

[Steltek]

It might not be a bad idea for you to burn a MEMTEST86+ ISO and use it to test your memory modules, one at a time, through several passes. One of the side effects of a failing memory module is often file corruption problems or file system errors.

If you haven't done it, it also might be prudent to download a diagnostic from your hard drive manufacturer's website and test your hard drive for faults as well.

 

[Eruditass]

The md5 check wouldn't be all that difficult. With python:

http://stackoverflow.com/questions/3431825/python-generating-a-md5-checksum-of-a-file

 

[Gooberlx2]

Could use something like fciv.

Generate checksums:

fciv.exe c:\users\x_kzy_xd\Pictures -r -type *.jpg -xml c:\users\x_kzy_xd\Documents\img_checksums.xml

Verify checksums:

fciv.exe -v -xml c:\users\x_kzy_xd\Documents\img_checksums.xml

But yeah, your images really shouldn't just corrupt for no reason all the time. I'd look into memory and/or hard disk problems, errant software, etc...

 

[Kaido]

Wow seriously? Like Steltek said, run a memtest & HDD scan ASAP. My wife has probably has 100K+ photos from her photo shoots and has never had corruption problems on either Windows or Mac.

What are you system details? OS, boot drive, etc.