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#11
In your case, it is crystal clear that 372.49 GB indicates that it was used on a Mcintosh, and the manufacturer of the PC had created the HPA wherein resides the image of the OS for recovery or whatever..
So the problem is due to HPA and not a corrupted MBR. And so it is no wonder that the HDD LLF tool did not touch the HPA. ( that is one of my favourite programs which I always use to zero my pen drives and recommend.)
Glad to know that you have seen the Atola blog Restoring Factory Hard Drive Capacity » Official Atola Technology Blog ( I had mentioned this in one of my posts here long back and infact my recommendation to you is based on it. :))
Honestly, I haven't come across any way to run the 32bit Capacity Restore Tool from outside Windows. I also do not know why the masters Atola do not have a 64 bit tool. May be there are some practical technical difficulties. Otherwise they would have made it.
May be an alternate way is to hide your 64 bits system partition, install 32bit Windows on another small partition just to run this tool once. Once you accomplish the task, you may revert your system back.
I may request other experts here to guide you on this, if you want to take that route.