let me say i have a Desktop pc[lets say pc a] with windows 7 installed at my hard disk ,I just brought another desktop pc[lets say pc b] wuth hardisk without operating system.

Now i am transferring just hard disks [a<-->b],why doesn't my desktop pc doesnt boot with windows 7 at my desktop pc b?

Is it there any technical reason for not booting[operating system doesnt load] in my machine b?

  • is one of the PCs UEFI and the other isn't? – SimonS Jul 6 '16 at 13:18
up vote 2 down vote accepted

From what I understand, you made a simple file by file copy of the system partition. This is not enough.

In order for your PC to boot to Windows, the BIOS/UEFI (the embedded program in the motherboard) needs to know where Windows files are. It does so by reading a special part of the hard drive which tells it where to look for Windows. This part is not a file and cannot be seen while looking at the filesystem.

Possible solutions are:

  • Use disk restauration tools (such as Testdisk)
  • Make a full binary copy of the disk, using either third-party software or GNU/Linux's dd command

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