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PostPosted: Mon Nov 27, 2017 9:33 pm 
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Joined: Sun Jan 25, 2009 2:00 pm
Posts: 81
Hello,
Try to find solutions for corrupted hard drives my friend has. Any advices on how to rescue files used on the server?
For several days I have tried 3 softwares, R-Studio, Data Rescue and EaseUS Data Recovery none of them was able to recover any file, even if they could recover files they where all corrupted. Is there any other solution, can a linux OS with recovery software be a better choice as the system is linux based?

I guess the drives partition structure or logical structure is a mess, probably why tested recovery software are not able to recover files. Wondering if a linux based software would have a much better chance? Any idea where to go from here?

Why does the mirror technique transfers its corruptness to the mirrored healthy disk? My thoughts where that if a disk goes bad mechanically or data based it will not be able to transfer anything to the mirrored disk and you have a safety net. Mechanically yes but not when things get corrupted you seems to be out of luck and mirror technique is not helping. Wish it could be a quick "healthy check" before the start of mirroring or the mirroring settings could be set for longer settings like once a week or every second day.... then you have a chance to stop before its to late. My friend had two working drives and the following day all was lost even on the mirrored disk, that sucks... 3TB of data gone.... and both disks are spinning fine...

Regards
Soren


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PostPosted: Wed Nov 29, 2017 10:11 pm 
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Joined: Sun Apr 02, 2006 9:05 pm
Posts: 1679
Location: Up State NY in the USA!!!!
Sorry to hear that your drives are corrupted. It is assumed that you mistook a mirror to be the same as a backup. This is a very hard thing to come to grips with at this point. If the data is really important there are companies that are likely capable of recovering the data on the drive for you. The last time I checked for someone it was going to be well in excess of $500.00 for the drive.

Paste this in the google search bar and this will at least get you started. "corrupted drive data recovery services"

This is the reason I copy the data to a couple of external drives and take them to friends houses.

If the data is not worth that it is at least an expensive lesson in what not to do to protect your data.

Sorry I don't have more for you...

Mike


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PostPosted: Thu Nov 30, 2017 10:47 am 
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Joined: Sun Jan 25, 2009 2:00 pm
Posts: 81
Thanks Mike,
Yes I feel sorry for my friend, fortunately he does have an external backup but as it looks he has lost 4 to 5 months of work it seems.
I have search the net and talked to recovery software companies and they all tell the last resort is professional companies but even they have problems with corrupted drives. I have read that they have superb reputation for drives that mechanically brakes or get dropped in the sea. There was a test with several drives, dropped on floors from high distance when spinning to heavy trucks driving over it as stay on seafloor for a week etc. The recovery was very high as they could replace broken and rusty parts and get it up running again +98-99 % was recovered. But there was one drive they had a very low recover rate on... yes the one with corrupted files where the directory structure is damage, if the case... you have lots of ones and zeroes without meaning.....
Specialist companies for recovery takes a starting fee of minimum $350.00 and from there.... it can be very expensive...

I was wondering if any one had experience trying Linux recovery software if that could have a "better" chance then win/osx packages. I tested with three different softwares and all failed so I guess there is a very little chance....

So let this be a little warning for others, that mirroring drives is a "false" safety net. Corrupted files is far more easier to struck you than mechanic drive failures and those corrupted files/drive structure get also mirrored to an healthy drive... in other words "adios files"

Regards
Soren


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PostPosted: Thu Nov 30, 2017 5:55 pm 
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Joined: Sun Apr 02, 2006 9:05 pm
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Location: Up State NY in the USA!!!!
So I take it that this is an SSD? If this is the case there are allot of them that are very bad, cheap but bad none the same. I have a friend that worked for a company for a few years working on SSD controller chips and he had a very, VERY low opinion of SSD and flash storage.

I have a couple of drives, one is a Sandisk Extreme Pro SATA 480GB unit with a 10 year warranty and the other is a HGST SSD SAS 400GB enterprise drive. Both not cheap but very reliable. SSD storage is cheap now and very fast but they are not all even remotely even. The major difference lay in the firmware that they use and for the most part is is actually really bad until you get into the enterprise stuff where reliability is king or they kill their business.

Sorry to hear about that and good luck, you will need it to recover the data from the sound of it.

By the way, look for the Backblaze report on HDD reliability that they put out every so often. They track drive failure rates by manufacturer and drive model and post the report. The HGST drives are always top of the heap in reliability. They have been very good to me over the last few years with no failures at all. Also I have a few of the WD Red drives that seem to be reliable as well.

Mike


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PostPosted: Sun Dec 03, 2017 5:58 am 
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Joined: Sun Jan 25, 2009 2:00 pm
Posts: 81
No it is actually normal drives "WD Caviar Green". They where pretty full before being corrupted and my friend was going thru files and deleted many to gain some more space. I'm not sure this eventually caused the HDD system to be corrupted or the hard drive it self did something bad. I was little surprised that it could mirrored over this to an healthy drive and take it done with it as well.
Thanks for the Backblaze info, I see their services looks interesting I will have a better look at this and also the HDD reports.

My HDD drives still have space, they have been working for several years now but after this experience I start wonder if it is time to upgrade to new drives. I have not restarted the NASLite-M2 in over a year, afraid that could be a starting point for drive failure if I do....

Thanks for input Mike

Regards
Soren


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PostPosted: Sun Dec 03, 2017 3:55 pm 
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Joined: Sun Apr 02, 2006 9:05 pm
Posts: 1679
Location: Up State NY in the USA!!!!
The last drives I had before changing them out and migrating the data to another array were in service for over 9 years without failure. They were on NASLite for the majority of that time. All were Seagate units and the oldest was a 200GB drive.

The present array is a RAID5 array with three 3TB WD Red drives. I am not a fan of the WD support at all or the firmware they have on the drives as they refused to work on a hardware raid controller by 3Ware regardless of what I did. I eventually had to put them on a Windows 10 machine and used the RAID engine built into the MB to get them in service. Still get pissed off thinking about them. No longer buy WD drives. I prefer the HGTS enterprise or NLS drives now. Seagate is a second choice as I have actually never been let down by them either. Keep in mind that I only buy the Enterprise rated drives or NLS drives for less than critical needs. They cost in most cases twice or more as much but are still far cheaper than loosing data that one wishes to keep! This you know now I suspect...

Good luck sir.

Mike


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