Mac file formatted storage devices (except floppy disks) are divided into one or more volumes, which are further divided into sectors. These sectors are known as logical blocks in HFS volumes. To reference and keep record of each file, file thread, directory and directory thread on volume, Mac systems use a Catalog file. This file is actually a B*-tree and thus to derive directory contents, system needs to traverse B-tree.
If this directory tree suffers damages due to any cause, you may need to reformat the volume and restore lost data from backup. If data backup is unavailable or damaged, use Mac Recovery applications. You might encounter following error with your Mac system while performing normal operations: “-127 fsDSIntErr”
It is an Input/output error and usually refers that file system has been hit by some internal inconsistencies. This may occur because of directory tree damage. To resolve the above issue, you can try listed solutions:
For correcting minor directory damages, you can use Disk First Aid. It is the part of Disk utility that can check and repair imperfections with HFS an HFS formatted volumes. This tool can repair structures like Extent B-tree, Catalog B-tree, Catalog File, Volume info etc. Try rebuilding the desktop. To carry out desktop rebuilding, press and hold Option and Command keys while starting the Mac system.
Run fsck in single user mode.
If problem persists, perform clean reinstallation of system software. It deletes all disk data, so perform full data backup prior to format the drive. Data backup should be complete and in good state while restoration.
So, it is recommended to always check backup log reports and verify if it contains all required files. However, if you suffer any issues with data backup, you can use third party Mac File Recovery software to scan your drive and recover lost data. Mac Recovery software are designed to use explicit scanning algorithms on drive affected from logical data loss.
These can locate such files by performing some secure steps and offer data restoration. With their interactive interface, you can use these applications easily. Stellar Phoenix Mac Data Recovery is an advanced and robust application to recover lost data from HFS+, HFSX, HFS Wrapper, HFS and FAT file system volumes. Equipped with rich graphical steps, it is a read-only application. This Mac Data Recovery software is compatible with Mac OS X 10.5.x, 10.4.x and 10.3.9.
The same problem I faced two days ago. Data lost can occur at any time and due to many reasons.There are many different companies which provide Data Recovery Vaughn service. Thanks for the post which helped me a lot.
ReplyDelete