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Article ID: 834160 - Last Review: December 3, 2007 - Revision: 2.3
NTBackup may not detect corrupted backup files during verification
When you use NTBackup to create a backup of your Windows 2000-based computer or server, NTBackup may not detect some forms of corruption or damage in the backup files during the verification pass.
This behavior occurs because the verification pass uses a checksum comparison to determine if there is corruption in the backup files. The checksum algorithm uses a word-wise exclusive OR operation (XOR) comparison of the backup data. If corruption occurs in the data at the same location in a word an even number of times, the checksum algorithm cannot detect this corruption.
NTBackup uses the word-wise XOR algorithm for compatibility with the Microsoft Tape Format (MTF) specification. Section 5.1 of the MTF specifies the use of this algorithm.
This behavior is by design.
APPLIES TO
- Microsoft Windows Small Business Server 2003 Premium Edition
- Microsoft Windows Small Business Server 2003 Standard Edition
- Microsoft Windows Server 2003, 64-Bit Datacenter Edition
- Microsoft Windows Server 2003, Enterprise x64 Edition
- Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
- Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
- Microsoft Windows Server 2003, Standard Edition (32-bit x86)
- Microsoft Windows Server 2003, Web Edition
- Microsoft Windows XP Professional
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Professional Edition
- Microsoft Windows 2000 Server
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