Burned vs pressed CDs

[David J Patrick]

In attempts to install ubuntu, on my thinkpad, I failed several times 
using a freshly burned CD, even though the md5 sums were good. Then, 
using an official ubuntu CD, it worked like a charm. I have also read 
about other folks whose CDrom drives would only worked with "pressed" 
CDs, not "burned" CDs. What's the difference ?
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