File System is the most critical data structure of any operating system. It manages all of your files and directories on your hard drive. Different operating systems have different file system and HFS Plus is the most popular among them. It is a general file system for Mac OS X operating system. This file system is made up of several basic components and Catalog file is one of them. It keeps record of all the files and directories of the hard drive volume. This is the B*-tree that is divided in fixed-size nodes, each one of 4 KB size. In case if the Catalog file gets damaged, your critical data may become inaccessible and you come across data loss situations. At this point, you need to opt for Mac Data Recovery to get your valuable and mission-critical data back.
In the catalog file, there are basically four types of nodes- Header Nodes, Index Nodes, Leaf Nodes, and Map Nodes. The Header node is initial node for referencing other nodes. Index nodes hold pointer records. The Leaf nodes contain data records and Map nodes store the map records. In some situations, your Mac system might report inconsistencies with the nodes that may cause hard drive volume corruption.
In a practical scenario, you may get below error message when you run Disk Utility for verifying the HFS+ hard drive volume:
“Invalid node structure”
The structure of all the file system nodes is common. It holds three basic components- list of records, list of record offsets, and node descriptors. Damage to this structure may damage the node and thus operating system can not access corresponding information from it.
Resolution
In order to sort out this problem, go through underwritten steps-
1) Run fsck utility in single user mode to detect and repair tree corruption.
2) If fsck does not work, use third-party repair tool to repair the tree.
3) Perform Erase and Install installation of Mac OS X operating system. It would fix all the issues, but also remove all data from the hard drive and you need
Mac File Recovery software to retrieve data.
Mac Recovery is possible with the help of powerful and third-party Mac Recovery Software. The applications use extensive scanning techniques for absolute and assured recovery. They come equipped with interactive and rich graphical user interface and thus do not demand sound technical skills for complete recovery.
Stellar Phoenix Macintosh Data Recovery is a read-only application that recovers all types of lost data from Mac hard drive. It recovers data from HFS, HFS+, HFSX, HFS Wrapper, and FAT file system volumes. The software is designed for Mac OS X 10.6, 10.5, 10.4, and 10.3.9.
