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Reading MTF Backup Files

, 4 Apr 2007 CPOL
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An article explaning how to read backup files created with the Microsoft Tape Format (MTF) specification.

Screenshot - BackupReader.gif


We use the NTBackup utility to backup our files at the office. Recently, one of the backup files turned out to be corrupt. Searcing for a solution, I came upon William T. Kranz's freeware ntbkup utility. Although ntbkup did a great job recovering the backup file, it is a command line utility. So, I decided to write a backup reader with a GUI.


Volume, file, and folder information in a MTF backup file is stored as so called Descriptor Blocks. MTF is a linear file format. Reading a MTF backup file is a straightforward process. A backup file contains Data Set Descriptor Blocks, which are followed by Volume Descriptor Blocks. Volume Descriptor Blocks are followed by Directory Descriptor Blocks, which are in turn followed by File Descriptor Blocks.

Each descriptor block is followed by one or more Data Streams. Data streams are used for various purposes. They can be used for padding, storing checksums, long file/folder names, etc. One or more data streams associated with a file descriptor block typically contain file data.

Using the code

To read a backup file, an implementation creates a new instance of the CBackupReader class, passing the name of the backup file as an argument. Then, a catalog is created using the CCatalogNode class. The CCatalogNode class has a tree structure. The root of the tree is the backup file itself. Its child nodes represent the data sets in the backup file. Each data set node contains one (and only one) volume node. Volume nodes contain folders and files as child nodes. To extract a file from the catalog, one traverses the tree to reach the file and calls the ExtractTo method of the CCatalogNode class.
// Open the backup file
CBackupReader mFile = new CBackupReader(mFileName);
// Read the catalog
CCatalogNode node = mFile.ReadCatalog();
// Extract a node from the catalog
node.ExtractTo(mFile, mTargetPath); 


  • Backup Reader was tested with a few relatively small backup files. The largest backup file tested was about 2 GB.
  • Compressed and encrypted archives are not supported.
  • Backup Reader works on Windows archives only. Although descriptor block definitions for other operating systems are included in the source code, they are not tested.
  • Archives that span multiple tapes/disks are not supported.


  1. ntbkup - William T. Kranz's freeware backup utility
  2. MTF specification and a Linux backup reader with C source code


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Ozgur Ozcitak

Turkey Turkey
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Comments and Discussions

GeneralError on Backup Reader PinmemberYasharGhassemi18-Apr-10 3:05 
Dear Mr. Ozgur Ozcitak
I have a big problem with your "Backup Reader" tool and it is, when I open a large backup file that is created by Windows Backup Software and has 10GB in Large. An error has shown as below :
"Exception of type 'system.outofMemoryException' was thrown".
Please help me to solve it. If you have any question about this problem or anything else please do not hesitate and contact me with this email : ""
Sincerely Yours,
Yashar Ghassemi
QuestionHow can I use this code to read SQL SERVER BACKUP Files (*.bck)? PinmemberVENKAT SEERLA10-Feb-10 21:35 
GeneralCompile this code Pinmemberananon10-Jan-09 10:54 
GeneralIs it compatible with Veritas BKF Structure PinmemberMaverick Debasish31-Dec-08 23:59 
GeneralRe: Is it compatible with Veritas BKF Structure PinmemberOzgur Ozcitak6-Jan-09 1:54 
GeneralRe: Is it compatible with Veritas BKF Structure PinmemberMaverick Debasish6-Jan-09 6:04 
Generalerror to compile Pinmembericelso20066-Oct-07 13:18 
GeneralRe: error to compile Pinmemberr_stevenz24-Nov-08 16:07 
QuestionAny help will be appreciated PinmemberSaeidehV30-Sep-07 23:34 
GeneralSQL MTF PinmemberDanielSass2-Sep-07 5:30 

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