Do I need to partition my 1TB HDD for using with Ubuntu? It is installed as /dev/sda.
My OS files are located in 256GB SSD.
Also 15GB of HDD is already used but I can't see anything. Is this due to formatting?
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Windows has created one huge partition covering all of your 1 TB HDD. They probably call it
D:\ or some such thing. You need to shrink that NTFS formatted partition to make room for Ubuntu.
Make as much room for Ubuntu as you want it to have, 100 GB, 200 GB, 900 GB or whatever. However, Do not create a new partition for Ubuntu, from within Windows!. Ubuntu uses
ext4 partitions, and Windows do not know how to create them. Keep the space in the HDD unallocated.
Follow other instructions to prepare Windows for Ubuntu installation, such as disable fast-boot and hybernation etc.
When you start installing Ubuntu from the Live-USB, you will see an option to install Ubuntu alongside Windows. Select that. The Ubuntu installer will find the unallocated space in your 1 TB HDD and offer to install Ubuntu there.
Hope this helps