By what technical characteristics can you determine that it is impossible to install more than one operating system on a computer?

Question

Iron

I plan to buy a new laptop, I look at the characteristics. On the old one, it was impossible to install another operating system in parallel, because the disk space was not divided into more than 4 parts. I had to use a virtual machine.
The service center said that according to those characteristics, it is impossible to install more than 1 OS. And why, I still don’t understand :(
Now the question arose of what to look at in the list of characteristics so that such a problem does not arise again.

Answer 1

The SC stupidly did not want to fool around with installing the system, if the system requirements (performance, RAM size) allow you to run each system separately, then installing several systems is absolutely not a problem, the main thing is that there is enough space on the HDD for everyone.
PS: Yes, there can only be 4 main partitions in the MBR and a bunch of logical ones, no one bothers to put the systems on the main partitions, and store the data on the logic, it’s just that the SCs don’t know how or don’t want to properly format the HDD and cut the bootloader.
PPS: If the new beech has EFI BIOS and GPT disk partitioning, then the number of boot partitions is practically unlimited, and you can install at least 100 copies of DOS, as long as the system has enough resources.
In general, the characteristics of the laptop please go to the studio.
Even in the SC they could decide that you want to put not a bootloader, but a hypervisor and start up virtual machines, then yes, there may not be enough resources for several simultaneously operating systems.

Answer 2

>The service center said that according to those characteristics it is impossible to install more than 1 OS.
The simplest solution to the problem is to justify the crookedness of the hands with technical characteristics :)
To be honest, I don’t see the question in the question, only a misled person.

Answer 3

Unless if the disk size is 64 gigabytes, then you should not install more than one OS.
But I'm much more interested in your answer to the question:
Why do you need a second operating system, if you can't even answer the question you asked yourself?