How to identify allocated blocks on NTFS disk
Is there a way to determine which clusters on an NTFS drive are allocated? I think along the lines of the display you see in the defrag program before starting to defrag.
I think you could parse the MFT, but it seems to me that this could take a long time on a system with potentially hundreds of thousands of files.
thank
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The easiest way is to get a bitmap of the disk with I / O controls. There is a good open source defragmenter that can give you a good example of how to do this: JkDefrag (NOTE: MyDefrag is not Open Source). Jeffey Wall WebLog also contains a bunch of links that might interest you.
Another interesting article on FSCTL_GET_VOLUME_BITMAP
I / O Control is provided by Microsoft.
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