The launch of Disk Drill 2.2 brought some major improvements to the Rebuild HFS+ Catalog File function. Sometimes an HFS+ partition becomes unreadable because the catalog file has become corrupted. Disk Drill’s “Rebuild” function uses the existing partition header to locate the B-tree catalog of the partition and then rebuild it. The rebuilt directory will allow you to access your files normally.
Improvements to the Rebuild function include:
- A more sophisticated algorithm that will be able to detect many more cases of corrupted directories and prompt the user to rebuild.
- Users can now write the recovered directory directly to the damaged disk. This avoids needing to have double the disk space in order to mount a virtual disk image to complete the recovery process.
How to Rebuild Your Directory
- You’ll know if you need to rebuild a directory, because when your disk shows up in Disk Drill, it will show the “Rebuild” button next to that drive or partition, instead of the usual “Recover” button.
- Click “Rebuild” and Disk Drill will run the catalog rebuild algorithm.
- When it is done scanning, Disk Drill will show you a preview of the rebuilt file directory for you to review. Take a look at it to make sure your file and folder structure looks
like you expected. At this point you have three options:
- Rebuild – Choose this option if the file structure looks correct and you want to rebuild the directory directly onto the existing drive.
- Mount Found Items as Disk – Choose this option if the file structure looks correct, but you would rather mount the rescued files to a virtual disk image, rather than overwrite the existing directory. Learn more about mounting to virtual disks.
- Back Arrow – Click the back arrow in the upper-left corner if the file structure does not look correct and you want to try other recovery options instead.