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21 Nov 2011  
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

In recovery environment->command prompt:
DISKPART
LIST DISK
SEL DIS 0
LIST PART
EXIT
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Please explain what it displays
The System Recovery Options screen shows "Operating system: Unknown on (Unknown) Local Disk." => It finds something "unknown" ... diskpart will tell you more
My System SpecsSystem Spec