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2011.03.17 13:36

NTFS 파일속성

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NTFS File Attributes

The NTFS file system views each file (or folder) as a set of file attributes. Elements such as the file's name, its security information, and even its data, are all file attributes. Each attribute is identified by an attribute type code and, optionally, an attribute name.

When a file's attributes can fit within the MFT file record, they are called resident attributes. For example, information such as filename and time stamp are always included in the MFT file record. When all of the information for a file is too large to fit in the MFT file record, some of its attributes are nonresident. The nonresident attributes are allocated one or more clusters of disk space elsewhere in the volume. If all attributes can not fit into one MFT record NTFS creates additional MFST records and puts the Attribute List attribute to the first file's MFT record to describe the location of all of the attribute records.

Table 5-3 lists all of the file attributes currently defined by the NTFS file system. This list is extensible, meaning that other file attributes can be defined in the future.

Table 5-3 File Attributes Defined by NTFS

Attribute Type

Description

Standard Information

Includes information such as timestamp and link count.

Attribute List

Lists the location of all attribute records that do not fit in the MFT record.

File Name

A repeatable attribute for both long and short file names. The long name of the file can be up to 255 Unicode characters. The short name is the 8.3, case-insensitive name for the file. Additional names, or hard links, required by POSIX can be included as additional file name attributes.

Security Descriptor

Describes who owns the file and who can access it.

Data

Contains file data. NTFS allows multiple data attributes per file. Each file typically has one unnamed data attribute. A file can also have one or more named data attributes, each using a particular syntax.

Object ID

A volume-unique file identifier. Used by the distributed link tracking service. Not all files have object identifiers.

Logged Utility Stream

Similar to a data stream, but operations are logged to the NTFS log file just like NTFS metadata changes. This is used by EFS.

Reparse Point

Used for volume mount points. They are also used by Installable File System (IFS) filter drivers to mark certain files as special to that driver.

Index Root

Used to implement folders and other indexes.

Index Allocation

Used to implement folders and other indexes.

Bitmap

Used to implement folders and other indexes.

Volume Information

Used only in the $Volume system file. Contains the volume version.

Volume Name

Used only in the $Volume system file. Contains the volume label.

 

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