Using the /CVTAREA Parameter in C#.NET

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Using the /CVTAREA Parameter
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For optimal performance after the conversion, use the /cvtarea parameter to prevent the MFT from becoming fragmented during the conversion. Before you use the /cvtarea parameter, you must first use the fsutil file createnew command to create a large file (typically 1/8th of the total volume size) in the root folder. This file is overwritten by the MFT during the conversion. If the file is larger than the space required for the MFT, the unused space becomes available space. If the file does not reside in contiguous clusters, an error message appears and the conversion fails. Defragment the volume, and then try running the conversion again. For more information about the fsutil file createnew command, see Windows XP Professional Help.
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If you do not use the /cvtarea parameter, volumes that are converted from FAT to NTFS (instead of being initially formatted using NTFS) lack some performance benefits because the MFT becomes fragmented after the conversion. Use Disk Defragmenter to defragment the MFT after the conversion. For more information, see Defragmenting NTFS Volumes later in this chapter.
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How Convert.exe Safeguards Data During the Conversion
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To guard against the possibility of corruption caused by failure during conversion, Convert.exe must build the NTFS metadata files by using only the space designated as free space by the FAT file system. Then, if the conversion does not finish, the FAT representation of the user files remains valid. A complication is that one sector of NTFS data must occupy a specific location on the disk, and a small number of other structures must occupy contiguous sectors. During the conversion process, Convert.exe performs the following steps: 1. Runs Chkdsk or Autochk to verify the integrity of the file system. Chkdsk runs when the conversion takes place while Windows XP Professional is running. If Chkdsk encounters an error, the conversion stops. You must use the chkdsk /f command to fix any file system errors, and then run Convert again. Autochk runs when you schedule the conversion to take place when the computer restarts. If Autochk encounters an error, Autochk attempts to repair the error, and the conversion continues. For more information about Chkdsk and Autochk, see 28, Troubleshooting Disks and File Systems. 2. Relocates FAT clusters for the fixed-location NTFS structure and other contiguous data (if necessary) and saves the new file allocation table. If the necessary sectors cannot be made available because they are unreadable, for example, the conversion process fails and the FAT volume remains in the same state it was in before the attempted conversion. 3. Creates NTFS elementary data structures in FAT free space. These are the fixed-size tables and structures common to any NTFS volume. The size of these tables varies depending on the size of the volume, but it does not depend on the number of files on the volume. 4. Creates the NTFS master file table and directory listings in the FAT free space. The space required for this step is variable and depends on the total number of files and folders on the FAT volume. 5. Marks as free, in the NTFS bitmap, those NTFS clusters being used by FAT-specific structures. After the conversion is complete, the FAT metadata overhead can be reclaimed as free space to NTFS. 6. Writes the NTFS boot sector. This is the final action that causes the volume to be recognized as NTFS instead of FAT. If the conversion fails at any step prior to this, the volume is still a valid FAT volume and is recognized as such.
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Almost all writes are to FAT free space, so a failure preserves the FAT intact. The following situations are the only times when a failure might cause problems. At the end of Step 2, when Convert.exe overwrites the FAT The algorithm for relocating clusters guarantees that if a failure occurs during this stage, Chkdsk can fix the disk without any loss of data. In Step 6, when Convert.exe writes the boot sector If a failure occurs during this step and the volume being converted is the system volume (the active, primary partition used to start the system), there is a chance that the system could be left in a state where it would not start. In the unlikely event that this takes place, start the system by using a Windows XP Professional startup floppy disk. For more information about creating a Windows XP Professional startup floppy disk, see article 119467, How to Create a Bootable Disk for an NTFS or FAT Partition. To find this article, see the Microsoft Knowledge Base link on the Web Resources page at http://www.microsoft.com/windows/reskits/webresources.
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