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I've read this article about http://www.tuxera.com/community/ntfs-3g-advanced/data-compression/ and I wonder if it's possible to replace the standart LZ77 compression with a faster one in Windows 7?

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Not unless you modify the Ntfs.sys kernel driver (the source code of which is not available outside Microsoft).

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Can you write a kernel module and use the ntfs-3g driver? –  Phpdna Oct 11 '12 at 14:46
Yes, you can write kernel drivers in C/C++; Microsoft provides an IFS (installable file system) development kit. –  grawity Oct 11 '12 at 14:48

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