Thank you for looking. So I have a 1tb SSD with Windows 10 as the master. I have also a HDD 2tb which had only Linux Ubuntu bionic Beaver, as the slave. The slave has 3 partitions. The largest has Ubuntu, then a 200GB partition has another Win 10 I just did this yesterday, thinking if I had another windows system I could do experiments safely, with my business system unaffected..? All went well until I lost the grub. Well, it went into Grub rescue on the master drive, which I don't understand how to use. I was able to run a 16.04 disk to do a boot-repair, and that fixed it so I at least have access to the master SSD with my business Win10. Whew. And I can select at the BIOS screen, the other HDD but, only will boot to the other Win10 there, and no way to boot Linux which is the big partition on hat HDD. Not sure how to see it. Sorry I get really lost on this partition stuff! Thank you for any help. All best
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