How can I swap between Hard Drives on one Monitor? Please help?

[Kewicase99]

Okay so I have 3 external hard drives and one laptop. I do have a OS on each of these external HD. How can I use one monitor (my main laptop) to switch over to each hard drive quickly like I run one task on my Windows 8 hard drive then jump over to my Windows 7 hard drive but doing it all on one screen? so I do not have to restart the computer and go into bios configure and then switch which hard drive to start up. How is this possible? Should I use a KVM for this? I need guidance

 

[ccampy]

You would need separate computers to do this

 

[das_stig]

1 PC per operating system, unless you run the other operating systems within a virtual machine.

 

[Kewicase99]

1 PC per operating system, unless you run the other operating systems within a virtual machine.

but how did this guy do this on youtube

https://www.youtube.com/watch?v=gWwzDeAUyVI

 

[USAFRet]

1 PC per operating system, unless you run the other operating systems within a virtual machine.

but how did this guy do this on youtube

https://www.youtube.com/watch?v=gWwzDeAUyVI

Just like das_stig said, a virtual machine.
In the case in that video, QEMU

 

[molletts]

but how did this guy do this on youtube
https://www.youtube.com/watch?v=gWwzDeAUyVI

He's running them in virtual machines under the Linux KVM (Kernel Virtual Machine) hypervisor. He's assigned the different graphics cards to different VMs using PCI redirection.

If you're doing it on a laptop, your best bet is just to run the "secondary" OSes in something like VirtualBox, running under your "main" OS. You'll need a lot of memory to do it well (i.e. what you want to have available to use in your main OS, plus what you want to use with each guest OS you plan to run simultaneously, plus a bit extra to soak up overhead). So if you want to run Win10 with at least 4GB available as your main OS plus Win7 and Win8 with 4GB each as guests, 16GB would be sufficient. Plenty of cores doesn't do any harm either but you may have little or no flexibility there depending on what laptop you have and how handy with a small screwdriver you are.

 

[USAFRet]

For instance, this is 5 OS's running in my system, using VirtualBox

Win 10 Pro, Windows Server2016, Linux Mint, Ubuntu, and the host system of Win 10 Pro.

 

[Kewicase99]

WOW! thank you guys everyone actually this made a lot of scene so I am now using Hyper-V to do this running off one laptop! works perfect!!!! thank you guys.