Actually it's a switch on the exterior. No need open case.
Master drive
Drive 1...Windows v7
Drive 2...Windows v10
Drive 3...Windows v11
Drive 4...Linux
Slave Drive
Single Shared Data Drive.
All 4 drives were connected to the switch, and the switch connected to the Motherboard. When power off, select which which Drive to boot. Power on to boot to selected OS. They all share same components.
This might be obsolete now days, but it worked.
Master drive
Drive 1...Windows v7
Drive 2...Windows v10
Drive 3...Windows v11
Drive 4...Linux
Slave Drive
Single Shared Data Drive.
All 4 drives were connected to the switch, and the switch connected to the Motherboard. When power off, select which which Drive to boot. Power on to boot to selected OS. They all share same components.
This might be obsolete now days, but it worked.

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