[wplug] Mysteries of md5sum

Mike techmike at gmail.com
Tue Aug 2 07:54:36 EDT 2005


I've seen this with image files stored on hard drives before. Seems to be 
more apparent with larger files. In the several GB range. In the past I've 
created a sum, then verified it instantly to find it fail. :/
 -Mike

 On 8/1/05, Chad Ziccardi <cz at digitalfreaks.org> wrote: 
> 
> On Mon, 2005-08-01 at 20:55 -0400, Christopher DeMarco wrote:
> > On Mon, Aug 01, 2005 at 07:20:52PM -0400, Bob Supansic wrote:
> >
> > > Same CD, four different sums, two of which were from the same
> > > device. What am I to believe?
> >
> > Well, *this* is interesting :)
> >
> > I've no idea what's going on, but I will make this observation: During
> > installation many distros will verify the md5sum of the installation
> > media (presumably CD-ROM). It stands to reason that the MD5 checksum
> > of a CD-ROM shouldn't vary among [correctly-functioning] drives, or
> > this "media check" would be useless.
> 
> We recently had some failed the md5sum media checks on brand new media
> from a vendor, upon cleaning the media and smacking the drive, they then
> passed the md5sum media checks and we were able to install.
> 
> Of course we first tried it in multiple drives, and same issue, so I
> guess something on the media's surface was the problem.
> 
> 
> --
> Chad Ziccardi
> cz at digitalfreaks.org
> 
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>
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