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In what condition could a HDD be wiped out all of data includes partitioning and become wholely unallocated

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Last Modified: 2013-12-01
Very sad , yesterday I had an accident , I realized that my HDD 80GB Seagate Barracuda could not boot anymore . It said " Invalid system disk " .
Very quickly , I used some boot disk to check and took that HDD to another PC , I recognized that what i could see was just a 74.5GB hard disk unallocated . Shock !
I swear the previous day I was chatting and sufing web , no things ever happened . It just like .. I dont understand ?
I have used Hiren boot disc , trying to recover but with no luck ., tried with testdisk , active partition recovery .. , I have spent days hoping to get it back but failed . I even cannot recover just some archieve files , it seems the hard disc was wiped so clean .

PLEASE reply , I need some explainings .
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