My computer has 2 hard disks. The first one is for the win 10 os. The second one is for data storage. They were both gpt style drives. Since it was a very old system, I decided to get it formated . I gave the system to the service centre to format the first HDD and install Windows 10 there .I asked them to not even touch the second drive. However after I received the system from them , I noticed that the uefi option was not enabled in the bios settings. Naturally, I saw that the windows installation was done on a legacy bios environment. I also noticed that the second HDD was still in gpt style.
What surprised me,was the fact that though the second HDD was still in gpt style while the first one was in mbr style (to support legacy bios), I could still access and modify files in the second HDD.
My question is: I had previously known that gpt drives are not supported on mbr system. So, why was I able to access the secondary HDD(which was in gpt while the system was now a legacy bios system)?
