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Inside Out
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Getting volume format and feature information A quick way to check the file system type and available features of a volume is to type fsutil fsinfo volumeinfo DriveDesignator at the command prompt, where DriveDesignator is the drive letter of the volume followed by a colon, such as C:. For a FAT or FAT32 volume, you ll see output similar to the following:
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Volume Name : LogData Volume Serial Number : 0x70692a2e Max Component Length : 255 File System Name : FAT32 Preserves Case of filenames Supports Unicode in filenames
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Using NTFS
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NTFS is an extensible and recoverable file system that offers many advantages over FAT and FAT32. Because it is extensible, the file system can be extended over time with various revisions. As you ll learn shortly, the version of NTFS that ships with Windows Server 2003 is in fact a revision of the NTFS version that shipped with Microsoft Windows 2000 Server. Because it is recoverable, volumes formatted with NTFS can be reconstructed if they contain structure errors. Typically, restructuring NTFS volumes is a task performed at startup.
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NTFS Structures
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NTFS volumes have a very different structure and feature set than FAT volumes. The first area of the volume is the boot sector, which is located at sector 0 on the volume. The boot sector stores information about the disk layout, and a bootstrap program executes at startup and boots the operating system. A backup boot sector is placed at the end of the volume for redundancy and fault tolerance. Instead of a file allocation table, NTFS uses a relational database to store information about files. This database is called the master file table (MFT). The MFT stores a file record of each file and folder on the volume, pertinent volume information, and details on the MFT itself. The first 16 records in the MFT store NTFS metadata as summarized in Table 20-3.
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Part 5: Managing Windows Server 2003 Storage and File Systems
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Table 20-3.
NTFS Metadata
Record Type File Name
MFT $Mft
MFT Record
Description
Stores the base file record of each file and folder on the volume. As the number of files and folders grows, additional records are used as necessary.
20
MFT mirror Log file
$MftMirr $LogFile
Stores a partial duplicate of the MFT used for failure recovery. Also referred to as MFT2. Stores a persistent history of all changes made to files on the volume, which can be used to recover files. Stores volume attributes, including the volume serial number, version, and number of sectors. Stores a table of attribute names, numbers, and descriptions. Stores the details on the volume s root directory. Stores a table that details the clusters in use. Stores the bootstrap program on bootable volumes. Also includes the locations of the MFT and MFT mirror. Stores a table mapping bad clusters. Stores the unique security descriptor for all files and folders on the volume. Stores a table used to convert lowercase to matching uppercase Unicode characters. Stores information on enabled file system extensions. Reserved records for future use.
3 4 5 6 7
Volume Attribute definitions
$Volume $AttrDef
Root file name $ index Cluster bitmap $Bitmap Boot sector $Boot
8 9 10 11 12 15
Bad cluster file Security file Upcase table NTFS extension file To be determined
$BadClus $Secure $Upcase $Extend To be determined
The MFT mirror stores a partial duplicate of the MFT that can be used to recover the MFT. If any of the records in the primary mirror become corrupted or are otherwise unreadable and there s a duplicate record in the MFT mirror, NTFS uses the data in the MFT mirror and if possible uses this data to recover the records in the primary MFT. It is also important to note that the NTFS version that ships with Windows Server 2003 (NTFS 5.1) has a slightly different
Part 5: Managing Windows Server 2003 Storage and File Systems
Microsoft Windows Server 2003 Inside Out metadata mapping than the version that originally shipped with Windows 2000 (NTFS 5.0). In the current version, the $LogFile and $Bitmap metadata files are located on a different position on disk than they were in Windows 2000. This gives a performance advantage of 5 to 8 percent to disks that are formatted under Windows Server 2003 and comes close to approximating the performance of FAT. The rest of the records in the MFT store file and folder information. Each of these regular entries includes the file or folder name, security descriptor, and other attributes, including file data or pointers to file data. The MFT record size is set when a volume is formatted and can be 1024 bytes, 2048 bytes, or 4096 bytes, depending on the volume size. If a file is very small, all of its contents might be able to fit in the data field of its record in the MFT. When all of a file s attributes, including its data, can be stored in the MFT record, the attributes are called resident attributes. Figure 20-2 shows an example of a small file with resident attributes.
Record 0 1 2 3 4 5 6 7 8 9 10 11 12 15 16 Record Type MFT MFT mirror Log file Volume Attribute definitions Root file name index Cluster bitmap Boot sector Bad cluster file Security file Upcase table NTFS extension file Reserved Users Files/Folders
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