From: Atom S. <at...@sm...> - 2006-11-18 18:12:24
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On Sat, 18 Nov 2006, jmk...@at... wrote: >>> Did you verify the md5sum of the CD after burning it, or just the sum >>> of the downloaded ISO file? ==================== windoze?!?! in my house!?!?! NEVER!!! i'm a long time freebsd/linux command line guy, but new to burning CDs and not used to doing things with a GUI (except running terminals in x-windows). i've got a CD burner on a spare box running ubuntu. >> just the iso. on ubuntu, how do i verify the burned CD? >> > Did you burn it on windows or linux? I'm afraid I only know how to > verify a CD on Linux, and even there I have to scratch my head and try > to remember it because I don't do it that often. > > A simple way to get the sum for a CD is: > > md5sum </dev/cdrom > > (where /dev/cdrom might be /dev/hdc, or however you refer to your CD rom drive) > > The problem with the simple method is that sometimes cd burners add a few > sectors of zeros to the end of the CD. The method above adds those sectors > to the md5sum, so it might not match even if the CD is good. > > Another approach uses dd to copy exactly the right number of bytes from the > CD before sending them to md5sum. For that you need to know the size of > the .iso file, and give dd the proper arguments so it will read only that > many bytes. > > There might be a much simpler approach, depending on how far your system > boots with the CD. Did it make it to the menu? I think there is a "check > CD" option on the menu, but I could be mistaken. =================== didn't make it anywhere near a menu... on one box it gave me the "ISOLINUX" copyright and hung, and the other box it gave me that and then a 'boot failed' message of some sort. it's like it can't find a kernel to boot from. i've got one box with freebsd, and one box with ubuntu. both boxes can read CDs. on bsd: # md5 < /dev/acd0 3f12b12ce3909219e60ff48882c89758 not good, but not definitive. i'd like to think that there's a simple GUI way to do it on ubuntu, but i didn't have any luck finding it. -- ...atom ________________________ http://atom.smasher.org/ 762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808 ------------------------------------------------- "The hope of the industry is that over time the market is so flooded [with genetically engineered organisms] that there's nothing you can do about it, you just sort of surrender." -- Don Westfall, vice-president, Promar International, Washington-based food and biotech industry consultants. |