So some details, for some reason I can't attach a screen shot of the disk management.
The machine is Asus Vivobook S400.
It comes with 500G hard-drive (which I intend to replace), and a 24G SSD/flash drive (which I don't have access to). The computer comes with a pre installed windows 8, and part of its features is to do a clean install and "remove everything and reinstall windows". So I figured that means there is an installation somewhere.
The disk management tells me that in the 500G disk, in addition to the partitions I used for normal file systems, there are three more partitions that I can't access: 300M EFI partition, 600M recovery partition and another 20.01G recovery partition.
In the 24G disk, there are 4G OEM partition, and another 18.36G Primary partitions.
I assumed windows installation is located in the 24G OEM partition. I was hoping that when I remove the old 500G and replace is with new SSD, windows installation would start automatically and install it to the new SDD, just as it did for the 500G when I first turned it on.
But now I can't tell if that is what is going to happen, and if not why.
And, where is the windows installation files are indeed located.
Thanks.