Mayank Desai's MCSE Notes

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2.4.3 File Compression

Windows Server 2003 supports file and folder level compression. Compressed files can be read and written

to by any Windows-based or MS-DOS-based application without first having to be uncompressed by

another program. When you access a file via a Windows-based or MS-DOS-based application, NTFS

automatically uncompresses the file. When you save or close the file again, NTFS compresses it again.

Therefore NTFS allocates disk space based on the uncompressed file size and not on the compressed file

size.

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