If you want to limit yourself to 0 < n < 100 file per subdirectory, and the leading 5 digits are same 99% of the time, then using the last 2 digits to form the bucket (subdirectory) may be the best way to go. Try it on your sample data to get a feel for wether it would create too many top-level directories.

If humans are going to be looking at the data, I recommend using the full ISBN for the filename. It'll save you mess later if/when you need to reorganize.

In reply to Re: brainteaser: splitting up a namespace evenly by dws
in thread brainteaser: splitting up a namespace evenly by perrin

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