That's certainly a big part of it. When one needs to buy a metric crap load of CPUs, one tends to shop outside the popular defaults.
Another big reason, historically, is that Supercomputers didn't typically have any kind of non-command-line way to interact with them, and Windows needed it.
Until PowerShell and Windows 8, there were still substantial configuration options in Windows that were 100% managed by graphical packages. They could be changed by direct file edits and registry editing, but it added a lot of risk. All of the "did I make a mistake" tools were graphical and so unavailable from command line.
So any version of Windows stripped down enough to run on any super-computer cluster was going to be missing a lot of features, until around 2006.
Since Linux and Unix started as command line operating systems, both already had plenty fully featured options for Supercomputing.
Almost, the default boot drive is C:, everything gets mapped after that. So if you have a second HDD at D: and a disk reader at E:, any USBs you plug in would go to F:.
Still, I don't get why'd you do that, all my windows installation automatically put boot files onto C: and did not allow me to touch them afterwards.
G: also seems completely arbitrary, and I'm the majority of windowa setups wouldn't exist or be an external drive.
Simple as.
The boot directory on your file system is where the system gets it from to put on G. It’s left there for recovery/repair
But you still have a G partition for the boot. It lets the computer itself have an easier time finding it (think labeled as boot). Your ssd is divided, it’s not a 2nd physical disk
The letter is arbitrary, so is C. It’s just the default