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I have been fascinated with Everything recently. It is a very simple utility that can manage to find stuff incredibly fast on NTFS because it reads the MFT and journal.

Is there similar utility for folder sizes? Almost every folder size utility I have used is incredibly slow with folders with many small files in it.

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I think there might be technical reasons that make determining filesize from the MFT difficult. – Amazed Aug 13 '11 at 16:54
Determine filesize from the MFT isn't like reading a signle attribute, like reading the filename and reporting it to a search window. By far the most time consuming aspect of the calculating folder size is traversing the directory listing. Optimizing a database to look for a file name is cheap. Harder to optimize is reconstructing the folder hierarchy then finding its size on the fly. – surfasb Sep 25 '11 at 1:58
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