How much data can I restore for hard drive ?

Hi My hard drive suddenly lost a lot data. After I connected the hard drive to new PC, I found the used capacity reduced from 80% to 30% in the hard drive, which may mean losing 50% data. Any one have some suggestion to restore the data ? Thank you
eemoonAsked:
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JohnBusiness Consultant (Owner)Commented:
First, determine the data is truly critical. If very critical, get a data recovery service.
 
Second, if not, use Recuva  https://www.piriform.com/recuva

 or GetBackData   http://www.getbackdata.net/ 

as good examples (well know) for data recovery.
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eemoonAuthor Commented:
Thank you so much for your fast reply. I think it is a good way and i will try it.
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nobusCommented:
the reduced capacity does not mean anything in relation to your data
it may be much more, or even nothing you loose
i agree that getdataback is the best !
a good recovery service is gillware : http://www.gillware.com/
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Ankit PareekOnline MarketingCommented:
Hey if your hard drive lost data then best way to restore  or recover your data from several avaiable tools. as per mention by John you can use get back data or recuva tools for backup. You can also uses ESUS data recovery or recoverymyfiles tool to easy recover your data. Just compare plans and purchase tools for easy recovery
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rindiCommented:
Just restore your data from your backups, that is what you made them for in the first place!

Besides that, if you are going to use recovery software, then you must install that software to another PC which you connect the HD from which you want to recover from to. It is very important that you never write anything to a disk you want to recover from, as any writes will overwrite data on that disk.
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eemoonAuthor Commented:
Hi I used Recuva to scan the hard drive. But I have not found some thing change or the deleted data come back. Maybe I did not use it in right way. Anyone can give me some suggestion ? thanks
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nobusCommented:
try Get Data Back - it's free to use - you only pay after seeing the data it can recover, so only for storing your data
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BillDLCommented:
You were advised by Rindi to first remove the hard drive from the computer, temporarily connect it to another working computer AS A SECOND DRIVE, and install the recovery software on THE MAIN DRIVE of the working computer.  You would then run the software and tell it to scan the second drive that you temporarily connected.  As he explained, if you install software onto a hard drive that you are trying to recover lost data from, it can overwrite the data you are trying to recover.

Is this how you ran Recuva?

I have never heard of software or the website named "GetBackData", so I can't comment.
I have a feeling that John Hurst meant to say "GetDataBack", but I'm not sure.

I recommend Get Data Back by runtime.org (https://www.runtime.org/data-recovery-software.htm).  You can use it as I described earlier, or you can burn their LiveCD to disc, boot the affected computer to it, and run the software directly from CD:
https://www.runtime.org/data-recovery-live-cd.htm
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BillDLCommented:
Thank you eemoon
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