createnew :
Creates a file of the specified name and size, whose content consists of zeroes.
 
 
FSUTIL Documentation

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Fsutil

Fsutil is a command-line utility that you can use to perform many FAT and NTFS file system related tasks, such as managing reparse points, managing sparse files, dismounting a volume, or extending a volume. Because fsutil is quite powerful, it should only be used by advanced users who have a thorough knowledge of Windows XP. In addition, you must be logged on as an administrator or a member of the Administrators group in order to use fsutil.