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RAID 0 Data Recovery

SERVER RAID 0:

I need some help with an older server which I have been using with a RAID 0 array in order to provide back-up data to my computer. I have had it for a while, and there is a lot of data on the drives that I really need to be able to recover. The problems started when I was copying files into the drives from a USB flash drive, deleting the data from the latter as I went. I suddenly noticed that one of the drives had powered itself off, and was not spinning. I looked at the server on Windows desktop, and it said that there was an error, the code apparently meaning that the disk is operating in a degraded mode. I do know that at least some of the data which I saved to the disks that morning is gone, and I don’t know how to recover it. The computer wants me to replace the hard drives with others, and I know that this means that I will lose all of the data which is still available, including research and projects which are not all completed.

QNAP NAS SERVER RAID 0:

I recently bought a QNAP NAS server in order to replace an older server which was struggling with modern computer operating systems and drivers. The old server was nearly obsolete, so I thought that I would just replace the server. I moved all my data into the disks which I decided would be set up as a RAID 0 system, and put these into the QNAP array. I pressed go on the server, and thought that this would be fine, but suddenly I am not able to see any of the ‘volumes’ which should be available under the array, and I can’t see any of the data which should be on the volumes. They all appear to be empty, but I have a lot of data on the files. I had been trying to create a mirror system to protect the RAID, could this have written over the data instead? I don’t want to do anything which could prevent the recovery of that data, which is why I am seeking your professional help.