MD5Sum and Check Disk For Defects
When burning an iso file (an image of a CD or DVD), it is important to not only verify the buring of the disc but to also verify the download of the data. Many times data can be corrupted when downloading large files or transferring large sets of data between machines. One time I had a Lynksys router that combined dsl and a local four port switch. It stated it could handle 100 Mb/s and indeed would… for the most part. But, if you transferred a large file or lots of smaller ones on machines on the local switch, it started dropping bits. It took awhile to figure out what was going on and to replace the hardware. Basically, the solution was to add a real switch behind the dsl router for local traffic. The data going to/from the Internet on dsl never got close to the threshold of dropping bits, but it made me aware that hardware manufactures can make junk sometimes, and it’s kept me away from future Lynksys products.
When you do download a large iso, say Ubuntu 9.04, verify the iso file against the published md5 hash at https://help.ubuntu.com/community/Installation/SoftwareRAID. Basically, this computes a one way hash of the entire iso and gives you a number, and if that number matches the published by the iso provider, you have a valid iso file. Download the md5sum here:
http://www.etree.org/cgi-bin/counter.cgi/software/md5sum.exe
Then simply launch a Dos window and run:
md5sum filename.iso
When burning the disc enable check for errors, verify or test (depending on your software). As the disc is created it will check to make sure the burn to the disc was successful.
After you have burned the disc, for an Ubuntu install, reboot and launch from CD. In the first menu choose “Check disc for defects”.
This is very important. I performed the above steps for verifying the md5 sum and burning and testing the CD and the CD still failed the Ubuntu check for disc defects test. It had several corrupted packages that somehow got burned onto disc.
I didn’t have to redownload the iso, just reburn the disc. The next time it passed.
Filed under: Technology | Tagged: 9.04, iso, Jaunty Jackalope, Linux, MD5Sum, Ubuntu
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