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Need help on recovering Data!

post #1 of 24
Thread Starter 
Hey guys, so today I was re-installing windows and I formatted my main OS drive within windows installer after that I restarted my PC to find out It formatted 2 Hard Drives. 2nd was my important data hard drive.
Anything I can rescue is helpful, does anyone know of any type of free or paid software that could help me out? Thanks.
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post #2 of 24
Basically what you need is to rebuild the fat table of that disk.

Unfortunately google searches on the subject are bloated with useless stuff, ads, promises, etc.
It's actually a very simple process and can be done with simple software, such as the free TestDisj - http://www.cgsecurity.org/wiki/TestDisk - that works on many OSes.
post #3 of 24
Thread Starter 
It's currently analyzing the cylinder. 4% for the past 20 Mins. Any suggestion on what to do once it's finished?
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post #4 of 24
I don't really remember because usually when I need it I just follow the instructions tongue.gif


When you "format" your drive, you simply write on it's fat table that the space your files were using are now free to be used. Your files are still there,
So what it's doing right now is it's scanning the hard drive, cluster by cluster to rebuild it's indexing table. (If you selected the right option)

It would take just as much as reading data from your whole hard drive, like a 650gb file, if it's the drive on your sig.
post #5 of 24
Thread Starter 
It's on a 640GB Hitachi drive. All the drive has been done is Formatted to NTFS and that's it. Nothing else. It's at 31% so lets see what happens.
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post #6 of 24
Try Glary Undelete, http://www.majorgeeks.com/files/details/glary_undelete.html and Piriform Recuva, http://www.piriform.com/recuva. Make sure that you don't install any of the tool bars, etc when installing. Both are freeware.
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post #7 of 24
Quote:
Originally Posted by RussianC View Post

It's on a 640GB Hitachi drive. All the drive has been done is Formatted to NTFS and that's it. Nothing else. It's at 31% so lets see what happens.

Let me explain so you get a clearer understanding of what's happening.

Your data get physically written to your hard drive, it's there.
Anytime you would read or write something, you need to put the drive's head on top of that physical space. If you didn't know exactly what position, you would have to search through the whole drive.
When you access a file, you go there and read it. The thing is you are reading many files when you are using your computer, so this process would be repeated for every file.

So what we do is we create some indexing tables, that have like the name of the file and it's coordinates. When you want to access a file you look for it on this virtual table, and then get it's position and jump straight to where it is.

When you format something on windows, you simply erase that indexing table. So basically the table is empty, you data remains physically there.

What you must be doing right now is the opposite of what usually happens, you are filling the table searching the HDD. That's why it's taking so long.

By the way, many of the software that claim do recover your data, is actually just using TestDisk's code to do the hard work.



And the guy above me was useful just to prove that this "area" of IT is just crowded with bloatware, ads, and mystic, when it's actually something pretty simple.
post #8 of 24
Thread Starter 
Thank you for the clarification. Only way it would really be deleted if I was to go on my HD Tune and do a whole HD Write with 0's. Now I understand.
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post #9 of 24
Quote:
Originally Posted by RussianC View Post

Thank you for the clarification. Only way it would really be deleted if I was to go on my HD Tune and do a whole HD Write with 0's. Now I understand.

exactly.
And to do a complete write with 0s that will also take a looong time, since writing takes longer than reading, usually.
Just divide 640000mb/ 30mb/s or whatever your average write speed is on that drive tongue.gif (in this example it would be clsoe to 6 hours).

However, since the entries in the indexing table are marked as "free to be used" you can't really control if something is going to write on top of you data, overwriting what was there. This can cause corruption, so this kind of recovery must be done as soon as possible.
post #10 of 24
/
Edited by RussianHak - 5/12/13 at 12:32pm
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