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It was checked for updates times by the users of our client application UpdateStar during the last month. The serial number for serial is available. Even with one noncompressed run, compressing this file saved 26 clusters of disk space, or 41 percent.

Although the diagrams in this chapter show contiguous LCNs, a compression unit need not be stored in physically contiguous clusters. Runs that occupy noncontiguous clusters produce slightly more complicated MFT records than the one shown in Figure When it writes data to a compressed file, NTFS ensures that each run begins on a virtual 16cluster boundary.

Thus the starting VCN of each run is a multiple of 16, and the runs are no longer than 16 clusters. NTFS reads and writes at least one compression unit at a time when it accesses compressed files.

The cluster size of the NTFS compression unit was chosen to reduce internal fragmentation: the larger the compression unit, the less the overall disk space needed to store the data. This cluster compression unit size represents a trade-off between producing smaller compressed files and slowing read operations for programs that randomly access files.

The equivalent of 16 clusters must be decompressed for each cache miss. A cache miss is more likely to occur during random file access.

Figure shows the MFT record for the compressed file shown in Figure MFT record for a compressed file. One difference between this compressed file and the earlier example of a compressed file containing sparse data is that three of the compressed runs in this file are less than 16 clusters long.

Any run shorter than 16 clusters contains compressed data that NTFS must decompress when it first reads the data into the cache. A run that is exactly 16 clusters long doesn't contain compressed data and therefore requires no decompression. If the data in a run has been compressed, NTFS decompresses the data into a scratch buffer and then copies it to the caller's buffer.

NTFS also loads the decompressed data into the cache, which makes subsequent reads from the same run as fast as any other cached read.

NTFS writes any updates to the file to the cache, leaving the lazy writer to compress and write the modified data to disk asynchronously.

This strategy ensures that writing to a compressed file produces no more significant delay than writing to a noncompressed file would. NTFS keeps disk allocations for a compressed file contiguous whenever possible. As the LCNs indicate, the first two runs of the compressed file shown in Figure are physically contiguous, as are the last two. When two or more runs are contiguous, NTFS performs disk readahead, as it does with the data in other files.

Because the reading and decompression of contiguous file data take place asynchronously before the program requests the data, subsequent read operations obtain the data directly from the cache, which greatly enhances read performance. Sparse files the NTFS file type, as opposed to files that consist of sparse data, described earlier are essentially compressed files for which NTFS doesn't apply compression to the file's nonsparse data.

However, NTFS manages the run data of a sparse file's MFT record the same way it does for compressed files that consist of sparse and nonsparse data. Entries include the following information about a file or directory change:. The journal is sparse so that it never overflows; when the journal's on-disk size exceeds the maximum defined for the file, NTFS simply begins zeroing the file data that precedes the window of change information having a size equal to the maximum journal size, as shown in Figure To prevent constant resizing when an application is continuously exceeding the journal's size, NTFS shrinks the journal only when its size is twice an application-defined value over the maximum configured size.

In NTFS, a file directory is simply an index of filenames that is, a collection of filenames along with their file references organized in a particular way for quick access.

To create a directory, NTFS indexes the filename attributes of the files in the directory. The MFT record for the root directory of a volume is shown in Figure Conceptually, an MFT entry for a directory contains in its index root attribute a sorted list of the files in the directory. For large directories, however, the filenames are actually stored in 4-KB fixed-size index buffers that contain and organize the filenames.

Figure shows only filenames in the index root attribute and the index buffers file6 , for example , but each entry in an index also contains the file reference in the MFT where the file is described and time stamp and file size information for the file. Even so, it's a significant speed optimization for directory browsing because it enables the file system to display each file's time stamps and size without opening every file in the directory.

The index allocation attribute maps the VCNs of the index buffer runs to the LCNs that indicate where the index buffers reside on the disk, and the bitmap attribute keeps track of which VCNs in the index buffers are in use and which are free. Figure shows one file entry per VCN that is, per cluster , but filename entries are actually packed into each cluster.

Each 4-KB index buffer can contain about 20 to 30 filename entries. Each filename in the index root attribute has an optional pointer associated with it that points to an index buffer.

The index buffer it points to contains filenames with lexicographic values less than its own. It points to an index buffer containing filenames that are lexicographically less than itself the filenames file0 , file1 , and file3. Note that the names file1 , file2 , and so on that are used in this example are not literal filenames but names intended to show the relative placement of files that are lexicographically ordered according to the displayed sequence.

Directory lookups are fast because the filenames are stored in a sorted order. And when higher-level software enumerates the files in a directory, NTFS returns already-sorted names. NTFS also provides general support for indexing data besides filenames, and several NTFS features including object IDs, quota tracking, and consolidated security use indexing to manage internal data.

This feature allows applications, using undocumented native API functionality, to open a file or directory using its object ID. Figure shows the organization of these indexes. A quota control entry contains the value of the user's quota limits, as well as the amount of disk space the user consumes on the volume. When a new allocation causes the user to exceed a threshold, NTFS takes appropriate steps, such as logging an event to the System event log or not letting the user create the file or directory.

NTFS has always supported security, which lets an administrator specify which users can and can't access individual files and directories. In pre Windows NTFS, every file and directory stores its security descriptor in its own security attribute. In most cases, administrators apply the same security settings to an entire directory tree, which results in duplication of security descriptors across all the files and subdirectories to which the settings apply. This duplication can intensively utilize disk space in multiuser environments, such as Windows Server Terminal Services, in which security descriptors might contain entries for multiple accounts.

NTFS assigns every unique security descriptor on a volume an internal NTFS security ID not to be confused with a SID, which uniquely identifies computers and user accounts and hashes the security descriptor according to a simple hash algorithm. A hash is a potentially nonunique shorthand representation of a descriptor.

Not deleting these entries doesn't significantly decrease disk space because most volumes, even those used for long periods, have relatively few unique security descriptors. NTFS's use of general indexing lets files and directories that have the same security settings efficiently share security descriptors. Storing the records in a central location enables NTFS to provide interfaces for applications to enumerate all a volume's reparse points or just specific types of reparse points, such as mount points.

See Chapter 10 for more information on mount points. Previous page. Table of content. Next page. Sample disk configurations A volume consists of a series of files plus any additional unallocated space remaining on the disk partition. Master File Table In NTFS, all data stored on a volume is contained in files, including the data structures used to locate and retrieve files, the bootstrap data, and the bitmap that records the allocation state of the entire volume the NTFS metadata.

Copyright C Microsoft Corporation All rights reserved. MFT record for a small file Each file attribute is stored as a separate stream of bytes within a file. DOT File. Resident and Nonresident Attributes If a file is small, all its attributes and their values its data, for example fit in the file record.

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Speaking of the NTFS reader for Mac free software, the tool we introduce on this part might become your cup of tea. When it recognizes your NTFS drive, your drive will automatically mount your drive, you can check to enable the targeted drive from Mac's status bar.

One-click to reach read-write support, then you are free to edit, copy, delete, transfer, read, and write files without any disk errors. Download for Mac 7-Day Free Trial. Step 1. Click the Download button. Run the software and click the Activate button.



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