Mac Data Loss Due to Missing HFS File System File ID
Allen Sood
August 11, 2009
HFS Plus (HFS+) is the most widely used, reliable and advanced file system, introduced by Apple Inc. for Mac OS X operating system. The HFS+ file system is made up of several objects or data structure and Catalog File is one of them. The catalog file is used by HFS+ file system to maintain critical information about hierarchy of the folders and files on a hard drive volume.
Every file and folder in catalog file is assigned a distinct CNID (Catalog Node ID). In case of damage to this id, entire hard drive might get damaged and you may come across critical data loss situations. At this point, you need to opt for Mac Data Recovery solutions to get your mission critical data back.
In HFS Plus file system, the catalog file is maintained as the B-tree file, and thus consists of the header node, leaf nodes, index nodes and map nodes (if required). The location of first extend of catalog file ( and thus the header node of the file) is stored in volume header. From header node of the catalog file, an implementation could obtain node number of root node of B-tree. From root node, an implementation could search B-tree for keys, as mentioned in previous section
Every folder or file in catalog file has a unique CNID (Catalog Node ID). For files, it is the file ID and for folders, CNID is folder ID, also known as directory ID. The file ID is assigned to data files as well as the file system files in HFS Plus file system. The CNID is assigned sequentially.
In some situations, the file system file id gets damaged or goes missing and your system can not start up. In such cases, you might encounter the below given error message:
"HFS File ID not found"
This error message renders your system inaccessible and cause critical data loss situations. At this point, you need to go for Mac Recovery solutions to retrieve your valuable data.
Recovery is best possible with the help of third party recovery applications, known as Mac Data Recovery software. These applications have got excellent ability to thoroughly scan affected hard drive and extract all of the data from it. These tools are quite easy to use and always carry out safe Mac File Recovery.
Stellar Phoenix Mac Data Recovery is the most powerful and robust tool to handle most of the Mac data loss situations. It recovers data from HFS, HFS+, HFSX, HFS Wrapper and FAT file system volumes. This software is designed for Mac OS X 10.5 Leopard, 10.4 Tiger and 10.3.9 Panther.
Every file and folder in catalog file is assigned a distinct CNID (Catalog Node ID). In case of damage to this id, entire hard drive might get damaged and you may come across critical data loss situations. At this point, you need to opt for Mac Data Recovery solutions to get your mission critical data back.
In HFS Plus file system, the catalog file is maintained as the B-tree file, and thus consists of the header node, leaf nodes, index nodes and map nodes (if required). The location of first extend of catalog file ( and thus the header node of the file) is stored in volume header. From header node of the catalog file, an implementation could obtain node number of root node of B-tree. From root node, an implementation could search B-tree for keys, as mentioned in previous section
Every folder or file in catalog file has a unique CNID (Catalog Node ID). For files, it is the file ID and for folders, CNID is folder ID, also known as directory ID. The file ID is assigned to data files as well as the file system files in HFS Plus file system. The CNID is assigned sequentially.
In some situations, the file system file id gets damaged or goes missing and your system can not start up. In such cases, you might encounter the below given error message:
"HFS File ID not found"
This error message renders your system inaccessible and cause critical data loss situations. At this point, you need to go for Mac Recovery solutions to retrieve your valuable data.
Recovery is best possible with the help of third party recovery applications, known as Mac Data Recovery software. These applications have got excellent ability to thoroughly scan affected hard drive and extract all of the data from it. These tools are quite easy to use and always carry out safe Mac File Recovery.
Stellar Phoenix Mac Data Recovery is the most powerful and robust tool to handle most of the Mac data loss situations. It recovers data from HFS, HFS+, HFSX, HFS Wrapper and FAT file system volumes. This software is designed for Mac OS X 10.5 Leopard, 10.4 Tiger and 10.3.9 Panther.
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