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#11
However, judging from the bottom screenshot in post number 8 - that computer was booted from Disk 1, the 500 GB SSD, and it loaded the OS contained on Disk 1 as well. The 250 GB disk is simply holding a data partition. There might be a Windows installation on it, but in post #8 it's just files sitting there, not the running OS.
I see no reason from what is posted in post #8 why you would not be able to reformat the 250 GB SSD.