Problems and Solutions with lost files
HFS/HFS+ Problems and Solutions
Deleted files from
Trash under
Mac OS X
Compatibility
File System Issues and Compatibility
Problems
and Solutions with lost files
A file found by the help of a file signature search algorithm is called 'lost'. These files can be found on drives without any file system data, or on a single drive after performing the Deleted File Recovery scan. Typically, these type of files can only be recovered if they are stored in one or consecutive clusters on the drive. Heavy fragmentation on the drive will adversely affect the recovery.
If the file size of these lost files could not be detected, they will assigned a default size specified internally to the program. The default size maybe too small for the detected file, e.g. if a bitmap file could be detected but the image is cut off at a position. In this case the size of the found lost file is too small and you can adjust the size for each single file by selecting Resize from the Expert menu. It does not matter if you specify a size above the real size of the file since most file types store their own correct size in the file.Another problem can occur if the recovered file is using an OLE Storage Format that is used by file formats like Microsoft® Word, Excel, PowerPoint, and many third party vendors. In this case FILERECOVERY® tries to detect the correct extension and rename the extension (e.g. to .DOC, .XLS or .PPT). If that fails the file extension will remain '.MOF'.
HFS/HFS+ Problems
and Solutions
Mac OS X uses the HFS/HFS+ (Hierarchical File System) for storing data on the hard drive. This is very different than the FAT or NTFS used by Windows®. The Mac HFS/HFS+ file system uses journaling to minimize data loss. Basically, journaling involves tracking all of the changes made on the files in a volume on the Mac. Normally, this journal file can be used by the system to revert to a previous state of the data on the hard drive. However, in some cases, this journal file can be corrupted and reverting the system will be unsuccessful. Full recovery of the path and file names may not always be possible, but the data may still be recoverable. Using the Deleted File Recovery with the RAW selection checked will recover a large amount of this type of lost data.
Deleted
files from Trash under Mac OS X
When a file is deleted under the Mac OS X operating system, the file is moved to the trash bin. Once the file has been removed from the trash, the name is completely wiped from the HFS+ file system. The only way to recover the data is to look for the raw bits and bytes of the file using the file signature search algorithm. Therefore, it is very important to make sure when scanning a Mac volume for deleted data, the RAW analyzer option is always selected.
FILERECOVERY® is compatible with all Windows® and Mac OS X file systems. There may be some problems with the way FILERECOVERY® accesses the disk and some antivirus, adware, and anti-spyware tools may report an error. For best usage, disable or uninstall any antivirus, adware, and anti-spyware tools before running FILERECOVERY®.
FILERECOVERY® is also compatible with ISO9660 and EXT2/3 file systems as well as drives with no file systems (RAW).
FILERECOVERY® cannot recover data from physically broken drives and devices. These can sometimes be sent in to our lab for recovery. For more information on that, please contact us here.
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