How can I restore files lost from RAID?

Multiple disk units known as RAID are widely employed in both home and office environments thanks to their high capacity, increased speed and, of course, resilience to disk failures. In fact, such systems have proved to be quite dependable, yet, under certain circumstances things may still go awry: faulty rebuild operations, errors of the RAID controller or software emulator, failed upgrades, server crashes or accidental deletion and formatting pose a threat to the integrity of data stored within the array and may even result in the total loss of files.

Earlier, data recovery from RAID could not be accomplished without professional assistance. Fortunately, nowadays, it is possible for a regular user, not just a tech expert, to restore files that were lost or deleted from a RAID storage using a dedicated program, like UFS Explorer RAID Recovery or UFS Explorer Professional Recovery. However, please mind that the procedure can be performed provided that the array remains functional (at the very least in the degraded mode). Otherwise, it is still highly recommended that you contact a reliable data recovery center for help, in particular, when you encounter any kind of physical damage or failure of one or more drives of the array.

It should also be mentioned that improper steps taken during the recovery procedure may cause secondary damage to the missing information and make it irretrievable. Therefore, before getting down to it, please make sure that you avoid the following operations:

  • Having connected the drives to the computer for data recovery, don't mount your RAID in the read-write mode to prevent data overwriting;
  • Don't try to rebuild the array, as this operation may create a new RAID with the default settings, which will overwrite the older configuration and thus make the data it contained irrecoverable. Moreover, this process increases the load on the system and may lead to the failure of one of the drives;
  • Don't keep running the storage in the degraded mode, as failure of another disk (and in the worst case, even more disks could fail) will make it problematic or even impossible to recover the lost data;
  • Don't attempt to repair the system or replace the failed disk until you are sure that all of the important data is recovered or backup copies of the member disks are created;
  • Don’t save any information to the affected RAID and don’t perform its full format. The best recommendation here is to stop using the storage until all important information is recovered or copied for backup purposes. The procedure of full format, the TRIM command on solid-state drives and other writing operations performed either by the system or by you imply permanent wiping of the data deleted or lost from RAID.

Data in RAID is not simply spread across multiple disks but allocated in accordance with the chosen distribution algorithm. In view of this, RAID recovery suggests the reconstruction of the array and subsequent search for deleted or lost files.

There are several types of RAID, and each configuration has its own characteristics that determine the peculiarities of the data recovery procedure and impact the probability of its successful outcome. In order to find out how to get your files back from a particular type of RAID, please, refer to the corresponding data recovery guide listed below:

Last update: June 05, 2024

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