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The cache is the area of RAM that contains the most recently used data. When you write data to disk, the lazy-write technique in Windows XP Professional indicates that the data is written when it is still in the cache. Cache memory can also be on the disk controller, such as cache memory available on SCSI controllers or on the disk unit, such as cache memory available on Advanced Technology Attachment (ATA) disks. The following information can help you decide whether to enable the disk or the controller cache:
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Write caching improves disk performance, particularly if large amounts of data are being written to the disk. Control of the write-back cache is a firmware function provided by the disk manufacturer. See the documentation supplied with the disk or disk controller. You cannot configure the write-back cache from Windows XP Professional. Write caching does not affect the reliability of the file system s own metadata. NTFS instructs the disk device driver to ensure that metadata is written whether or not write caching is enabled. Non-metadata is typically written to disk and can be cached. Read caching in the disk does not affect the reliability of a file system.
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When NTFS detects a bad sector, NTFS dynamically remaps the cluster containing the bad sector a recovery technique called cluster remapping and allocates a new cluster for the data. If the error occurred during a read, NTFS returns a read error to the calling program and the data is lost. If the error occurs during a write, NTFS writes the data to the new cluster and no data is lost. NTFS puts the address of the cluster containing the bad sector in the bad cluster file, $BadClus, in the MFT so that the bad sector is not reused. Warning
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Cluster remapping is not a backup alternative. After errors are detected, the disk must be monitored closely and replaced if the detect list grows. This type of error is displayed in the system log of Event Viewer.
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FAT uses a form of cluster remapping, but only when the volume is initially formatted. If a bad sector occurs on a FAT volume after it is formatted, data stored within the associated cluster can be permanently lost. NTFS handles cluster remapping dynamically and continuously, ensuring the integrity of your data.
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This section is useful for administrators who need information about the on-disk structures of NTFS volumes. These structures give NTFS basic advantages over other file systems used in Windows XP Professional.
Master File Table and Metadata Files
When you format a volume using NTFS, Windows XP Professional creates a master file table (MFT) and metadata files. The MFT is a relational database that consists of rows of file records and columns of file attributes. It contains at least one entry for every file on an NTFS volume, including the MFT itself. Because the MFT stores information about itself, NTFS reserves the first 16 records of the MFT for metadata files (approximately 16 KB), which are used to describe the MFT. Metadata files that begin with a dollar sign ($) are described in Table 13-12. The remaining records of the MFT contain the file and folder records for each file and folder on the volume.
13:
Working with File Systems
Table 13-12 System File Master file table
Metadata Files Stored in the Master File Table
File Name $Mft MFT Record 0 Purpose of the File Contains one base file record for each file and folder on an NTFS volume. If the allocation information for a file or folder is too large to fit within a single record, other file records are allocated as well. Guarantees access to the MFT in case of a singlesector failure. It is a duplicate image of the first four records of the MFT. Contains a list of transaction steps used for NTFS recoverability. The log file is used by Windows XP Professional to restore consistency to NTFS after a system failure. The size of the log file depends on the size of the volume, but you can increase the size of the log file by using the Chkdsk command. For more information about the log file, see NTFS Recoverability earlier in this chapter. For more information about Chkdsk, see 28, Troubleshooting Disks and File Systems. Contains information about the volume, such as the volume label and the volume version. Lists attribute names, numbers, and descriptions. The root folder. Represents the volume by showing free and unused clusters. Includes the BPB used to mount the volume and additional bootstrap loader code used if the volume is bootable. Contains bad clusters for a volume. Contains unique security descriptors for all files within a volume. Converts lowercase characters to matching Unicode uppercase characters. Used for various optional extensions such as quotas, reparse point data, and object identifiers. Reserved for future use.
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