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Old 07-26-2003, 08:31 AM   #1
butface
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Angry Whats 'Checksum'?


As I started to load Linux 9 you can do a disc check. I did it & it said disk 2 & 3 failed I cleaned them & it still failed, any thaughts? On disk 6 it couldn't read it as it said ' no Checksum added. What?What is that when it's at home? Should I download the whole thing again? from an FTP sight?

Butface
 
Old 07-26-2003, 08:48 AM   #2
qwijibow
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a checksum is an algorithm applied to a file (or cd) which when completed cretes a small string which is unique to that file.

So, if you download an importand file (like the operating system) its a good idea to run a cheksum check on it.

If the checksum of the downloaded file mathes exactly the checksum of the file on the server, then the download was a complete sucess. if however the checksum does not match, then the file was corrupted on download.

you can probably check disk 6 by getting its checksum string from the distributor.

If the checksum check fails, then your coppies are corrupt, and you should get a new copy.. either buy a distribution (you can get them very cheap from ebay, (it is perfectly legal to make coppies of linux, and RE-SELL them) or re-download the file.

maybe your disks will still work, its a gamble and might cause crashes, or whatever, you dont know. maybe the corrupted part is just a screen saver... maybe its a major runtime library, or worse the kernel
 
Old 07-26-2003, 08:55 AM   #3
butface
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Thanx
 
Old 07-26-2003, 05:02 PM   #4
Mara
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Quote:
Originally posted by qwijibow
a checksum is an algorithm applied to a file (or cd) which when completed cretes a small string which is unique to that file.
The problem is that's not true. It's possible to get the same checksum for 2 different files. A chance for such a situation is very low, but it's not 0.
 
Old 07-27-2003, 01:06 PM   #5
qwijibow
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Well yeah, But it will be a VERY cold day in H3LL before a random download corruption causes that to happen
 
Old 07-27-2003, 02:46 PM   #6
Mara
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With so many files downloaded every day (and so big files), it may happen (it's too hot to calculate probabilities, just my guess ).
 
Old 07-27-2003, 03:06 PM   #7
fancypiper
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How To Check MD5sums On A Linux Iso Image
# Cheap CDs
Discount Linux CDs
Linux Central
Cheapbytes
TuxCDs
ComputerHelperGuy
 
Old 07-28-2003, 07:03 AM   #8
butface
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Wow this forum is brilliant. Thanx guys I'll try all of this info.
 
  


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