Easier and more reliable ISO downloads, with error correction

Lars Wirzenius lars at canonical.com
Tue Nov 6 22:17:42 UTC 2007

On ti, 2007-11-06 at 17:12 -0500, Phillip Susi wrote:
> In my 12 years of extensive Internet use, and several years prior to 
> that of using BBSes, I have NEVER had a download corrupted.  It seems to 
> me that the sophisticated error detection and correction measures in the 
> underlying links are sufficient to prevent such errors.

The error checking in the TCP/IP layer is usually sufficient, but not
always. The checksum is short enough (32 bits, if I remember correctly)
that errors can creep in. I have had it happen at least once to me.
Unfortunately, the errors are more likely the more you download, and the
more traffic there is -- meaning that at release time, for example,
things are most likely to break, when people download huge ISO files.

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