I am a Windows 10 user and I would like to try Ubuntu 18.04.3 LTS. I use Windows 10 to my 595 GB disk 0 (C:) and I wish to install Ubuntu on my empty 595 GB disk 1 (D:). My aim is to select which operating system to use on every startup. Therefore, I shrunk disk disk 1 (D:) and created an unallocated 200.20 GB partition in order to install there Ubuntu. I booted into Ubuntu using a USB Ubuntu bootable drive. In the partitions table, I clicked the 214 gb free space, and chose the following partitions for installation (I haven’t made any change yet or proceed to the installation).
/dev/sda TYPE SIZE USED SYSTEM /dev/sda1 ntfs 209 MB 42 MB Windows 10 /dev/sda2 ntfs 424 GB 108 MB /dev/sda5 swap 9 GB /dev/sda6 ext4/ 20 GB /dev/sda7 ext4/home 185 GB /dev/sdb /dev/sdb1 ntfs 639 GB 581 GB /dev/sdb2 ntfs 300 GB 448 MB
You can see that I partitioned the free space to /dev/sda5, /dev/sda6 and /dev/sda7.
- How can I know which drives are /dev/sda and /deb/sdb? Since Windows 7 is installed on disk 0 (C:) and having used already 543 GB there, while disk 1 (D:) is empty, I suppose that /dev/sdb is disk 0 (C:) and that /dev/sda is disk disk 1 (D:). Is that correct? Furthermore, as the free space which was in disk 1 (D:) became /dev/sda5, /dev/sda6 and /dev/sda7, I assume again that disk 1 (D:) is /dev/sda. Are my thoughts correct?
a) May someone explain to me what is the device for boot loader installation? Do I already have such a device? If so, how can I find which it is?
b) I must choose to select either /dev/sda or /dev/sdb. The installer defaulted to dev/sda. Does it matter which I choose? Will a wrong choice affect my windows installation or files on disk 0 (C:)? Is it possible that I won’t be able to boot on Windows 10 if I choose wrong?
- In the worst case that something goes wrong with the boot loader installation, can I fix that problem booting from my USB bootable drive or I will have to reinstall Windows 10?
Note: There are similar questions here and here. The first link troubles me, the second link doesn’t give details for the boot loader installation, and both links don’t answer all my questions.
Thank you in advance for any help!