Data Clinic Case Study

Recovery of approximately 6TB of data from a 6 disk Seagate NAS device running RAID 5

The Fault

Seagate NAS The NAS had reported that one of it’s 6 disks had failed. The client had followed the recommended course of action and replaced the faulty disk but the NAS had then failed to rebuild. This meant the NAS had crashed and all the data on it was now inaccessible.

Notes

With errors like this, one disk failing on this Seagate RAID 5 NAS will mean the system continues to work without loss of any data but in “degraded” mode, this means file and folder operations are slower as the NAS performs more calculations to serve the data required.
By removing the faulty drive and replacing it with a new one, the NAS should have gone into an automatic rebuild which integrates the new hard disk into the RAID set. In this case the rebuild did not complete. This was due to problems with one or more of the other disks which the NAS had not yet detected. When the rebuild operation hit these problems it was not able to complete and thus the whole NAS failed, taking the files and folders offline.

Recovery

Analysis of the failed NAS showed that 3 out of the 6 disks in the RAID 5 had developed problems, and while the NAS had successfully detected a problem with one drive and recommended it be replaced, it had not detected problems with any of the other drives. To recover the data successfully would mean recovering the data from every disk bar one that made up the RAID, so at least 2 of the faulty disks would have to be accessed and data read from them before the files held on the NAS could be rebuilt and recovered successfully.

Result

Data Clinic were able to fully recover all the data from this NAS.

Seagate NAS Storage

Seagate are a very popular manufacturer of NAS equipment, producing smaller (often 2 disk) storage hard drives for the home, usually operating either a RAID 0 (stripe) or RAID 1 (mirror) up to more business oriented NAS file servers, usually running RAID 6, but we have seen some running RAID 6, RAID 10 and RAID 50. Along with Western Digital, Seagate are the worlds largest manufacturers of hard disk drives.

Links

Data Clinic’s main NAS data recovery section
Data Clinic’s Seagate data recovery section
Data Clinic’s Western Digital (WD) data recovery section

Mark Ainsworth

13:51 02 Sep 20

Data recovery specialists managed to recover the data off a failed hard drive for us. With many loved photos and memories stored on the hard drive it was a relief to get this work done.It was done quickly and with expertise.

alex shakeshaft

16:29 20 Aug 20

Used Data Clinic to retrieve lost files and photographs from broken/damaged drive. Drive was damaged by overheating from failed fan.The company were very professional . Service and communications excellent and second to none. Sometimes retrieving data is more than files . Photos restore memory images .I have no hesitation in recommending this company for any retrieval and restoration of lost data .

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