My Hard Disk size was 320 GB (With 3 partitions C, D, E) when I gave to Service to re-install the OS Windows 7 Home Premium 64-bit in my Laptop. After Service, it was only 286.34 GB. With no partitions being done. All in C drive. Service person says that, Windows 7 Home Premium 64-bit will occupy that much space. But, when I bought the same Laptop, the Hard Disk capacity was 320 GB when the said OS was already installed. What happened to my hard Disk? If the person is right, then how come, it was 320 GB when I bought with the same OS? Where is the rest 34 GB?