hi again Bruno,
I'm on bus and just gave it to the shop !
He says what you mentioned that when use both linux and windows sometimes a partition jump(if translation be true) occures and also it occurs more in western digital hards and he have seen these cases before.
Well its occurance right now is dissappointing.

I got it and now in home i saw that partition of linux is cleaned completely,
Like a horrible dream.
Whay such things are happening?
Only good thing is that i had predict maybe this terrible thing happen and copied my necessary folders to external hard disk,maybe your guess pointing to mother board and power be true.
Now what can be done?
Can the operating system Ubuntu be returned back by recovery?

Hi Ehsan,

Didn't they tell you what they did to fix the computer?

We need to first know what exactly they did on the shop. Because it might be possible to recover the files, or it might be completely impossible to recover the files, depending on what exactly they did :(.

Best regards,
Bruno

hi Bruno,
People work in the shop are only a brother and sister.he told me he uses a recovery card and its software on his Windows.
I called him and he surprised that it happened for linux partition too and then said that it happens mostly for western digital and samsung hards.
He told that boot files can't be recovered by this method,only folders and files in them can be recovered.
Please tell me what questions should i ask him to get enough information.
He says that partitioning when formatting of disk has been done,may has been done incorrectly.
But i have been using it for 10 months while windows and linux have been both there on disk,why it should happen exactly now.
I think maybe its better to download 12.04 LTS Ubuntu and install it and OF and all other programs again.

Hi Ehsan,

The details I want to know are:

1. What was the problem that was detected in the shop? In other words:
   1. Were there any problems with the motherboard?
   2. Were there any problems with the CPU?
   3. Were there any problems with the Power Supply Unit (PSU)?
2. My suspicion was that there was a hardware problem, but it could also only be a problem with the NTFS partitions, which were getting a bit too damaged from the crashes and excessive file accesses from Ubuntu, without passing by Windows enough times for it to correct things itself.
   The questions here are:
   1. What was exactly done to fix the NTFS partition that was broken?
   2. Was the partition reformatted?
   3. Was there any new software installed?
   4. Was there any application used for specifically fixing Windows partitions?
   5. Were all partitions reformatted?

And I forgot to ask this to you Ehsan: when you wrote that the files for Ubuntu were missing, do you mean that you were not able to boot onto Ubuntu and only to Windows?
Or did you mean that you did boot to Ubuntu, but all of the files were missing?

Like I said, I need details! I'm not able to see what you are seeing, so I need you to describe in detail what you are seeing!

Best regards,
Bruno

Hi Bruno,
The linux partititon had deleted too,he in the shop says that only some folders like boot are seen in recovered folders and desktop isn't there.
My main cases folders were on desktop,why it can't be recovered in your opinion according to your knowledge and experience?

Hi Ehsan,

So many possibilities... a few possibilities come to mind:

1. Ubuntu might have been installed with a separate home partition. This would explain why the boot data was found, because only the main Ubuntu partition was found. Problem is: where was the home partition and why wasn't it found as well?
2. When whatever happened for the other files to get erased in the first place, the desktop folder also somehow got erased as well. But in the confusion, you might have not noticed it.

Beyond this, I haven't got enough details in order to estimate what happened. I've asked you several times as to what exactly happened before the files were missing, but you haven't managed to give me a detailed description of what happened.

And whatever else I may estimate, would have roughly the same probability of being as correct as the possibility of a black hole 1000 light-years away having caused a rift in time and space, and therefore caused a localized EMP that disrupted the contents of the hard disk. :(

Best regards,
Bruno

dear Bruno,Hi
I didn't bring all the case of the PC to the shop because I don't think he can find if there is any problem in hardware.I asked him that may main board be responsible for these data losses and he told these problems are more software issues than hardware.

about series two of questions I have to say that I didn't format it,only for question 2 of series 2,I had installed some softwares like Fluent in Windows but only one time used that.
dear Bruno,it may be a problem with power or AMD main board,because the problem occurs in new hard disc(WD,2TB) when copy large folders too.the small window that shows copying disappears and the source folders lost too."it is a copy problem" both in windows and Linux,I have to change both Main Board and power when I get rid of these problems and could defend.
I wan to say all of these horrible dreams that take place in real life in the defense session!
what your opinion about copy issue? it seems that maybe PSU can't supply enough power when work with large(around 10 GB) folders.in older hard as I told before when I even open a large folder,mouse movements became discontinue and all things became lock,when I wanted to copy them to another partition so that its space be lesser,it locked too and I had to restart the PC and after that all the partition deleted.after recovery as you know next partition deleted(it was there before recovering the other partition) and when it recovered the Linux lost.
I called him now and the folders that I managed to copy them to external hard before Linux issue has recovered (when I wanted to re-copy folders from external to internal,they lost,I don't know why this happen only when writting occurs to internal hard,but I can copy large folders to external hard)
home folder was in Linux,I thik maybe he has recovered swap partition,but he says that it has 50 GB space.

Hi Ehsan,

Indeed, this seems to be a problem with the power supply :( You can try unplugging the DVD drive, to see if this reduces the amount of electricity necessary to go around the system.
In addition, if the external hard drive is not self-powered, this could also could be a cause for the stress made on the power supply.

Problem is that I've seen similar problems to this one where:

• in one case the power supply was to be blamed;
• but on another was the motherboard that was getting very old and began to incorrectly control the hard drive or to disturb the power supply to the hard drive.

As for the hard drive to loose a whole partition due to a power failure, perhaps it was only able to reset the bits when the power requirements were lower and then was not able to set them back properly when more power was needed.
The other possibility is that there could have been physical damage to the plate of the disk, but this would have been diagnosed by the SMART system that hard drives have got: http://en.wikipedia.org/wiki/S.M.A.R.T.

With any luck, only the file structure was damaged and photorec could have been used to recover files, but those files would have to be manually seen by you to ascertain what they were... and with OpenFOAM cases, this is a complete nightmare :( Just to imagine over 1000 "U" files with no indication to which case they belong to...


Thinking back:

• Either when you tried to clean the heat sink for the processor, something got damaged (I already wrote about this before);
• or perhaps when you cleaned the heat sink for the CPU, you should have also cleaned the power supply.
  But now, it's too late to think about cleaning it, because it's probably already damaged.

Some equipment does exist for testing power supplies, but I'm not familiar with it and I don't know how much exactly that equipment can diagnose.

So I can only guess that a new power supply would be less costly part of them all right now, although you have to be very careful if the power rating on the new one is enough to handle all of the hardware. I believe that for your current system, perhaps 650W would be best.


Good luck! Best regards,
Bruno