NAME

ntfstruncate - truncate a file on an NTFS volume

SYNOPSIS

ntfstruncate [options] device file [attr-type [attr-name]] new-length

DESCRIPTION

ntfstruncate truncates (or extends) a specified attribute belonging to a file or directory, to a specified length.

OPTIONS

Below is a summary of all the options that ntfstruncate accepts. Nearly all options have two equivalent names. The short name is preceded by - and the long name is preceded by --. Any single letter options, that don't take an argument, can be combined into a single command, e.g. -fv is equivalent to -f -v. Long named options can be abbreviated to any unique prefix of their name.

-f, --force

This will override some sensible defaults, such as not using a mounted volume. Use this option with caution.

-h, --help

Show a list of options with a brief description of each one.

-l

Display licensing information.

-n, --no-action

Simulate the truncation without actually write to device.

-q, --quiet

Suppress some debug/warning/error messages.

-v, --verbose

Display more debug/warning/error messages.

-V, --version

Show the version number, copyright and license of ntfstruncate.

attr-type

Define a particular attribute type to be truncated (advanced use only). By default, the unnamed $DATA attribute (the contents of a plain file) will be truncated. The attribute has to be specified by a number in decimal or hexadecimal :

Hex	Decimal	Name
0x10	16	"$STANDARD_INFORMATION"
0x20	32	"$ATTRIBUTE_LIST"
0x30	48	"$FILE_NAME"
0x40	64	"$OBJECT_ID"
0x50	80	"$SECURITY_DESCRIPTOR"
0x60	96	"$VOLUME_NAME"
0x70	112	"$VOLUME_INFORMATION"
0x80	128	"$DATA"
0x90	144	"$INDEX_ROOT"
0xA0	160	"$INDEX_ALLOCATION"
0xB0	176	"$BITMAP"
0xC0	192	"$REPARSE_POINT"
0xD0	208	"$EA_INFORMATION"
0xE0	224	"$EA"
0xF0	240	"$PROPERTY_SET"
0x100	256	"$LOGGED_UTILITY_STREAM"

attr-name

Define the name of the particular attribute type to be truncated (advanced use only).

new-length

Specify the target size of the file. It will be rounded up to a multiple of the cluster size. A suffix of K, M, G, T, P or E may be appended to mean a multiplicative factor of a power of 1000. Similarly a suffix of Ki, Mi, Gi, Ti, Pi or Ei may be appended to mean a multiplicative factor of a power of 1024.

EXAMPLES

Resize to 100MB the file database.db located in the Data directory which is at the root of an NTFS file system.

BUGS

There are no known problems with ntfstruncate. If you find a bug, please send an email describing the problem to the development team:
ntfs-3g-devel@lists.sf.net

AUTHORS

ntfstruncate was written by Anton Altaparmakov.

AVAILABILITY

ntfstruncate is part of the ntfs-3g package and is available from:
http://www.tuxera.com/community/

SEE ALSO

ntfs-3g(8), ntfsfallocate(8), ntfsprogs(8).