Recover Mac

Recover data on Mac after Catalog corruption

HFS Mac volumes contain various forms of data in the form of files and other items. Apple OS makes use of a Catalog record for identifying each of these items. The crash recovery capability of the system is improved by maintaining a large amount of redundancy in the data structures. The B-Trees present on the system can be made use of for recovering the contents present in the directory. These Catalog records are made use of even by the Finder in Mac for searching of files.


Though each file on Mac has an unique identification number by which it is identified, these files and folders are however represented with respect to their parent directories. This hierarchical arrangement of items helps Finder in locating items easily on the Catalog B-Tree. The Catalog record is hence an essential part of Mac. Corruption of the Catalog records makes the items present on Mac inaccessible. It is hence very important that these Catalog records are kept safe from threats that exist on Mac.


There are various reasons that could lead to corruption of these catalog records, resulting in the loss of data. Some of the common data loss causes are accidental deletion, corruption of the file system due to use of third party software, unexpected shutdown of the PC, power surge etc. Though the data is inaccessible, it does not mean that the data has been lost forever. The data can be recovered using a good Mac recovery software. Unerase Mac Data software is a professional data recovery software customized for Mac users. This easy to use recovery software recovers not only your deleted/lost files but also your deleted/lost partitions. Photos may become inaccessible due to catalog corruption, but you can use this Mac recovery software to recover lost photos on Mac hard drives. On addition, You can perform file recovery on different types of file types like music, videos, photos and so on from different types of memory card. You can recover file from corrupted SDHC card in quite easy and effective manner.


Note: For those Mac users, who have accidentally deleted their Mac hard drive partition can implement this tool to restore all the files from erased Mac partition in few easy steps. To know more about this topic click here

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You can follow the simple steps given below, to recover your deleted/lost partitions with ease


Step 1:Double click the desktop icon or select the application from the programs list to launch Mac Data Recovery software. This displays the main window of the software, as shown in Figure a.


Main Window

Figure a : Main window


Step 2: The drives and volumes that are detected by the system get displayed as shown in Figure b. Choose the drive from which the deleted/lost volumes have to be recovered, and then click the Recover button.


Select drive

Figure b : Select Drive


Step 3: Just as you click the Recover button, a new window is displayed, where the user can select the appropriate option, is displayed, as shown in Figure c. There three options available for the user are,

  • Display default volume(s) - The default volumes present on the system are displayed when you select this option. This option lets you recover data from the volumes that already exist on the system.
  • Scan for volume(s) - Use this option to search for lost, missing and corrupted partitions. The software does a scan of the system and displays the lost, missing and corrupted partitions if any..
  • Raw Search on Physical Drive (File Recovery) – This option enables you to perform an extensive sector by sector search for lost files.


Select appropriate option

Figure c : Select appropriate option


Step 4: Click on the Display default volume(s) option. Clicking on the Display default volume(s) button displays the already existing volumes on the selected drive, as shown in Figure d. Select the volume which contains the deleted or lost data, and then click the Next button.


Select volume

Figure d : Select volume


Step 5: Click on the Next button to select the Scan Method that you want to make use of, as shown in Figure e. You can select from two options.


  • Standard Scan- This is a faster and a more time saving scanning process, which can be used, if the file system corruption is not severe. You can use this scan method when the logical volume fails to mount.
  • Advanced Scan- This is a scanning method that consumes more time, but is more effective than the Standad scan method, since it does an exhaustive search on the selected drive.

Select the Standard Scan option.


Select Scan option

Figure e : Select Scan option


Step 6: The software starts to scan the selected drive the moment you click the Standard Scan option. The software searches the drive for the lost data, and lists all the found files and folders in a tree format, as shown in Figure f.


Found files and folders

Figure f : Found files and folders


Step 7: Once the recovered files get listed in the tree format, the next immediate step is to select a safe location where the recovered data can be saved. If you want to save all the listed files, click on the Root folder or specifically select the files you want to save, and click the Save button.

A window to choose the destination drive is displayed when you click the Save button. Specify the destination drive, where you want to save the data, and then click on the Save button.


To save the data that you have selected onto the selected destination drive, click on the Save button. The data gets saved immediately. The saved data can now be accessed as before.



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