[cisco-voip] Media Check?

Sat May 22 20:56:28 EDT 2010

As long as the md5sum was copied from the original ISO intact then the verification should be intact.  If the rip itself implanted a new md5 then it could report a false positive.

I think the risk of a bad burn implanting an md5 that would show up as accurate is incredibly low.

-Ryan

On May 22, 2010, at 4:56 PM, Jason Aarons (US) wrote:

> Since I made the ISO from original media it makes sense why the Media Check failed if it’s looking for a implanted MD5 value.  I was using the basic ISO Recorder power toy free with Windows 7 and don’t recall any md5 options, I suspect it’s didn’t implant a md5 value.
>  
> I’m trying to understand if I had made the ISO with a implanted md5 and then burned a DVD with the md5 would that md5 be validated by the Media Check? (doesn’t the md5 also validate the media wasn’t tampered with?)(and did I get the steps right?)
>  
>  
>  
> From: Ryan Ratliff [mailto:rratliff at cisco.com] 
> Sent: Saturday, May 22, 2010 8:50 AM
> To: Wes Sisk
> Cc: Jason Aarons (US); cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] Media Check?
>  
> Is it possible that the ISO generated did not have the md5 implanted? 
>  
> -Ryan
>  
> On May 21, 2010, at 9:18 PM, Wes Sisk wrote:
> 
> 
> mediacheck verifies the md5sum of the iso contents
> http://www.digipedia.pl/man/doc/view/implantisomd5.1/
> 
> If mediacheck is throwing an error there is a problem with the media.  It may appear the install was successful but it should be considered suspect at best.
> 
> /Wes
> 
> On Friday, May 21, 2010 7:01:17 PM, Jason Aarons (US) <jason.aarons at us.didata.com> wrote:
> 
> If you use a commercial off the shelf copy dvd software I wonder if the md5sum of the disc is the same?  Or if you make ISO image of disk then burn ISO back to new disk is the md5sum the same?
>  
> I’ll research that Monday. Wikipedia might have some answsers, etc.
>  
> From: Ryan Ratliff [mailto:rratliff at cisco.com] 
> Sent: Friday, May 21, 2010 4:22 PM
> To: Jason Aarons (US)
> Cc: Scott Voll; cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] Media Check?
>  
> So the media check actually does an md5sum check of the disc image.  It is more than just a physical disk check.
>  
> -Ryan
>  
> On May 21, 2010, at 3:19 PM, Jason Aarons (US) wrote:
> 
> 
> 
> I had assumed the Media Check did some sort of checksum or verified some files or something more complex.
>  
> From: Ryan Ratliff [mailto:rratliff at cisco.com] 
> Sent: Friday, May 21, 2010 3:09 PM
> To: Scott Voll
> Cc: Jason Aarons (US); cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] Media Check?
>  
> I believe the media check simply checks the physical disk (ie making sure it can read from all sectors, etc).   If this is the case then it is entirely possible that the date required for the install is not on a part of the disc the media check detects as faulty.
>  
> On a separate, but related note, for downloaded files that you burn to ISO, always make sure to verify the md5 sum.  A corrupted download of an iso file will burn just fine, but still result in a failed install.
>  
> -Ryan
>  
> On May 21, 2010, at 3:01 PM, Scott Voll wrote:
> 
> 
> 
> 
> did an upgrade of CM 5 to 7.  Same kind of issues.
>  
> but it failed on the original and worked on the burned DVD.
>  
> Weird.
>  
> Scott
> 
> On Fri, May 21, 2010 at 11:47 AM, Jason Aarons (US) <jason.aarons at us.didata.com> wrote:
> I made a ISO image of my New Install 7.1(3) DVD (03/31/2010  10:41 AM     3,358,169,088 UCSInstall_UCOS_7.1.3.30000-1.sgn.iso)
> 
>  
> I can mount the ISO fine in VMWare Workstation 6.5 or VMWare Server 2.0 and install CallManager 7.1(3) fine without running the Media Check.
> 
>  
> I later re-ran the install this time choosing Media Check and notice that it fails the media check! Is there some sort of issue with Media Check? I then burned the iso to DVD and did another install fine, but later ran the Media Check and found the DVD had failed.  What's up the Media Check failing?
> 
>  
> I then had 3 other co-workers compare the file size and they all confirmed the same file size as 3,358,169,088.
> 
>  
> Everything works great just the Media Check fails.
> 
>  
>  
>  
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