>>>> OK. So it's called a file allocation table rather than a directory
>>>> listing. Same difference.
>>>
>>> Um, no. These are two entirely different things.
>>
>> In what way?
>
> http://en.wikipedia.org/wiki/FAT_file_system#Design

Oh, I see. So the FAT is just a map of free clusters?

I don't think that impacts what I originally said though; you could 
still cache it.

> In the same way that a linked list is an entirely different thing from a
> hashtable.

Conceptually, a dictionary is a dictionary, regardless of which data 
structure you use to implement it.

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