BootCamp will only work off a single drive/partition where both macOS and Windows OS’s sit. You can use a second drive (or multiples) as data drives for either OS (or even other OS’s).
Your only means to run dual OS is full isolation (requiring a reboot to switch) without using a VM product. A Virtual Machine (VM) can do what you want but its much harder to setup with multiple drives and some products are not able to do it.
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
0
Can you see both drives after booting into MacOS and going into Disk Utility?
crwdns2934271:0crwdnd2934271:0 Andrew S crwdne2934271:0
Yes Disk Utility shows both SSD. but BootCamp shows only main SSD. just talked with apple support and said that bootcamp will not allow install windows on second drive. I bought SSD, bought Sata cable for iMac and now discovered that can't install windows here, what the Hel l :|
crwdns2934271:0crwdnd2934271:0 Ramaz crwdne2934271:0