You're referring to the last integer that Perl will not convert to a floating point number, and thus lose the least significant bits and the ability to increment the integer meaningfully.
I don't know the exact answer. A simple boolean search would find it for you. The question is somewhat academic, as the chances of exceeding it in practice are quite rare. Databases are the only practical files of that size, and you'd use native code for the actual access.
If you're really trying to access files larger than 9 petabytes (9*10^15 =~ 2^53) directly, using a scripting language, then I'd like to rent that time machine you're using.
Lastly, if you put [] around your http: link, it would be rendered directly clickable.
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[ e d @ h a l l e y . c c ]
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