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List:       opensuse
Subject:    Re: [opensuse] How to check the MD5 checksum in Windows
From:       "Carlos E. R." <robin.listas () telefonica ! net>
Date:       2006-12-18 1:11:27
Message-ID: Pine.LNX.4.64.0612180023410.901 () nimrodel ! valinor
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The Sunday 2006-12-17 at 15:19 -0800, Randall R Schulz wrote:

> > Maybe so, but nevertheless, my downloaded image was in error.
> 
> Well, there's no accounting for software errors and their failure to 
> detect hardware errors or other software errors...
> 
> Incidentally, what software did you use to perform the retrieval? I 
> don't think I've ever gotten corrupt ISO images using Azureus.

aria2c, a metalink client, which uses ftp and http protocols to download 
from different servers. 

Azureus is a bittorrent client, and that protocols is capable of error 
checking and correction: you should never see an md5sum error with that 
one (and if you get them, there is a bug in the client, IMO).

But, AFAIK, both ftp and http downloads do not have error checking nor 
correction capabilities, other than what tcp has.


> Nonetheless, there is a subsequent chance for error (when writing the 
> optical media), and since you must check after that last point at which 
> errors may be introduced, it's not clear there's much advantage to 
> doing so earlier. Sure, you can save the cost of one piece of R/O 
> media, but if you use R/W media, then it's a wash--you might as well 
> wait till the final stage before verifying. Then you only have to do it 
> once.

Burning takes some time, the dvd media has a cost - even if it is 
relatively cheap -, and I hate to make more coasters, I already have too 
many of them. Further, the writer unit wears down, the lenses are made of 
some kind of plastic which ends by deforming and inutilizes the unit.

And finally, I would hate to reboot the computer with the newwwwww dvd, 
and then learn I got a new coaster. I prefer to know where I stand as soon 
as possible.

   [The "newwwwww" above is the consequence of the non existent keyboard 
   repeat bug, not me -  just for the record :-) ]

- -- 
Cheers,
       Carlos E. R.
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