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I want to have install Linux on a machine with windows. For dual boot, I want to use UNetbootin, which only show me the option to install the iso in drive C. The point is:

1) My drive C is almost full (115/118gb)

2) I have more 3 empty drives with 300gb.

3) I am considering 35gb for Linux.

If I clean and transfer all my files and backups from drive C, I got 15gb in free space but still not enough for Ubuntu 18. I would like to know, which other files (among program and system files) I could move from the default drive C? Any suggestion?

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    Uh, are you sure UNetbootin actually installs a proper dual-boot OS? It's generally only made for making bootable USBs – so it wouldn't be installing a full OS but just making the computer boot the "live" system... (A full dual-boot OS wouldn't install to "drive C" in the first place – it would have its own partitions.) Overall this plan sounds a bit strange. – user1686 Oct 10 '19 at 5:31
  • Sorry maybe I did not explained well. But if you look at unetbootin.github.io you can see it, there is a option to choose USB of hard drive, and in this case just the drive C. – Vinicivs Oct 10 '19 at 5:39
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    The tool will place a bootable installer there (that may or may not be used as a live OS, depending on the image you have). Then, to actually install Linux you will need to boot from the chosen device and pick yet another location. It seems you're on a good way to wipe your Windows in vain. When you say "3 empty drives", do you mean partitions or separate disks? Probably partitions, since UNetbootin doesn't let you choose them; but please confirm. A good way is to create a bootable USB pendrive, boot it and install to empty partition(s) without even touching Windows system partition. – Kamil Maciorowski Oct 10 '19 at 6:12
  • Thanks Kamil. Yes, I will do it, make a bootable USB. There is a another point here: I said drivers but you are correct, I wanted to mean partitions. But actually, C is a separated SSD with all system files and programs. So, can I still install the distro on the other drive within any of the empty partitions? – Vinicivs Oct 10 '19 at 6:44
  • Yes, a proper Linux installation media will install the OS on any disk you like and take care of the dual-boot. But have you looked at Ubuntu in the Microsoft Store which avoids the dual-boot headache? – harrymc Oct 10 '19 at 8:41
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If you want to install a new OS, you have to be sure that your HDD have enough continuos space. You can use the defragment tool provided by Windows, be sure to defragment the empty space as contiguos space for have a suitable "piece of data" for install the system.

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  • Thanks. Now I want to know, for the case of dual boot, can I install the SO in empty partition in one drive while Windows is installed in another drive (SSD)? – Vinicivs Oct 10 '19 at 8:29
  • Of course, linux is smart enough to write the boot loader on the master bot records, no matter how many disk there are (: – alessiosavi Oct 10 '19 at 9:02

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