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(Win32) Filesystem allocation page size?

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In Win32 is there a way to determine the size of an allocation page on a filesystem? I'm writing a function to truncate a file from the current position by changing the EOF value. I want to also free any allocation pages no longer used after this is done, but I have to know the size of an allocation page to accomplish this. I know that typically the allocation pages on an NTFS filesystem are 4 KB, but I can't depend on that value, as I want to be able to use this code on any PC with Windows. Any help is appreciated.

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