Note

To exercise full discretionary control over individual files, you must store those files on an NTFS volume. For the sake of compatibility, Windows 7 supports the FAT and FAT32 file systems used by early Windows versions and many USB flash drives, and the exFAT file system used on some removable drives . However, none of the FAT-based file systems support file permissions . To enjoy the full benefits of Windows security, you must use NTFS . For more information about file systems, see "Choosing a File System" on page 905.

Whenever you attempt to walk through a controlled "door" in Windows (for example, when you connect to a shared printer) or any time a program attempts to do so on your behalf, the operating system examines your security access token and decides whether to let you pass . If access is permitted, you notice nothing. If access is denied, you get to hear a beep and read a refusal message.

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