For the recovery of data specialised equipments are necessary, for the identification first of the hard drive or the hard disks causing problems, and then the recovery of the hard disks necessary for the rebuilding of matrixes and subsequently recovery.
In general these NAS configurations use LINUX operating systems, RAID software for data storage on hard drives and virtual volumes (LVM). In certain cases, these NAS configurations are more difficult to recover than a RAID matrix configured on a HP, IBM or DELL server, where there is only a hardware matrix.
DO NOT UNDER ANY CIRCUMSTANCES ATTEMPT TO REBUILD WHEN THE NAS IS NOT WORKING, OR YOU RISK LOSING ALL OF YOUR DATA.
DO NOT EXCHANGE NAS HARD DRIVES UNLESS YOU KNOW WHAT YOU ARE DOING.
Usually the most destructive factor is the customer attempting to exchange the disks without really knowing what to do or to rebuild in hope of solving the problem. They contact us next and we can only find that the data cannot be recoverede.
IF the NAS is brought to service exactly in the state it is when it stops working, there are 95% chances of recovery.
If you have a NAS which is no longer working send it for a free diagnosis. In consequence we will be able to give you more details of the means of recovery data in your case . How to send NAS equipments for service. For details click here.