Originally Posted by novaglider
I would LOVE to install the ubuntu on D:/ drive and have everything there! That would be a perfect solution. Yet during the installation I was only asked if I want to install ubuntu alongside Windows. I was never asked on which drive. - That is why I assume that Windows and Ubuntu have to be on the same disk. If that is not true, please let me know and I will do my best to place ubuntu ob D drive.
You can dual boot with each OS on separate drives. However, your installation will need to be done from an Ubuntu OS so you have full ownership over your options.
Windows needs lots of disk space but linux distros don't. So you could install Windows on the 400gb disk and Ubuntu on the 50gb disk.
Are the disks hdd or ssd? If they're hdd, then the older hdd is going to die sooner. So the OS holding all your important personal files should go on the newer hdd.
Of course, this problem is removed if you create a separate data partition as a storage space for all your personal data. This partition should be on the newer hdd.
I tried with the USB thing - I wasn't satisfied with the speed of my computer. That is why switched to my hard disk drives.
But a USB is an ssd. It's much faster than a hdd.
Speed is dependent on your CPU and how much RAM you have. How much RAM have got?
Remember, Windows 10 needs 20GB for its OS. Ubuntu will need less than 5GB for its OS. We can surmise from this that if Windows needs 4 times more space, maybe its doing 4 times more operations for each task. Essentially, Ubuntu should be faster.
I had an old 160GB hdd and a new 1TB hdd. So I put Windows in the 1TB and 4 linux distros in the 160GB hdd! Initially, I couldn't re-format the 160GB hdd because the partitioning software saw files on the hdd. But Windows wouldn't let me delete those files. I had no ownership of my hdd.
So I physically removed the hdd and Windows refused to work. After using a separate Windows recovery disk Windows started working again. I then used a linux live-usb and re-formatted the 160GB hdd from NTFS to ext4.
After that, Windows couldn't take control of the hdd and I was able to use it for linux distros.
Your 400GB drive is a lot of space. You can have Windows, Ubuntu and other distros, a data partition to backup personal data and even a swap partition to increase your RAM capability. To do this, you'll need to find out more about partitions.
To install different linux OSs on either drive, you can copy the relevant .iso file (i.e. OS installation file) onto your USB. Whichever partition the linux distro is going into, make sure the file format is ext4 (for example) and not NTFS. Windows cannot see ext4 file format - and this gives you privacy and security.