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

Data Clinic Reviews

Data Clinic Ltd

4.5

Jacob Greenwood

14:38 30 Mar 18

5* customer service! Recovered my father's book from an old drive, also retrieved some long forgotten about photos. Simply cant put a price on something like that.

Jarek Roover

12:21 30 Jul 18

Go there if you lost your data

Tony Cowgill

15:56 10 Apr 13

We've used Data Clinic twice now - once for my son's laptop which held all his University work and suddenly seemed to just die, that was recovered with ease. And then secondly in connection with work when our office computer system backups were somehow corrupted. These people really know their stuff - they are very helpful and professional and quick! Thanks so much for everything.

Rob Deighton

11:33 09 Dec 16

Happy to recommend Data Clinic to anybody that suffered Data Loss on storage Media. The guys were extremely helpful and knowledgeable and made the recovery of our valuable data a stress free experience.

George Thorpe

12:19 20 Feb 14

My company provides IT support to approximately 60 Yorkshire based companies ranging from small 10-15 users up to Enterprise sized organizations. Due to disk failure a client recently lost their entire database. We contacted Data Clinic and within hours a representative was onsite, several hours later the drive was returned, again in person by Data Clinic Manchester. I would not hesitate contacting them again, outstanding service in a market that can mean life or death to a business. 10 stars if there was an option!

Kieran Collins

21:02 25 Oct 18

Fantastic. Could not fault them at all, Brilliant, 10 year old iMac full of data and they had the data back to me in 72 hours. Communication via e-mail was fast, clear and superb.

David Tett

14:36 24 Aug 18

Sent them a 4tb WD Red hard drive to recover. They quoted me £588 incl VAT and recovery media. I was a bit sceptical so I asked for it to be returned. First they sent me the wrong hard drive (a 500GB WD Blue). Not too careful about data protection then. When I eventually got the drive back it had been totally stripped and outer casing binned (would have been nice to know about this beforehand). I decided to send it to Curry's PC World. They quoted £90 + recovery media. All data recovered and both hard drives returned within a week. What more is there to say.

Elle Sweet

22:12 20 Aug 18

Awful communication, I was constantly chasing them for updates on my device. My device was with them days before work was started on it. The data this company couldn’t retrieve was later retrieve by Apple. Waste of a £110.

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