Rather than trying to explain stuff, how about you show some facts.
Code:
sudo fdisk -l /dev/sd[a-z]
and
Code:
lsblk -e 7 -o name,size,type,fstype,mountpoint
Use code tags when posting or the results will be unreadable here and you won't get any help.
If the HDD was connected to a Windows system previously, Windows probably left the file system mounted. The only fix for that is to have Windows close the file system. Nothing can be done from the Linux side. Also, Windows has some new ways of dealing with file systems which are incompatible with Linux. If the partitions are "basic", then you'll need to convert them, again, using Windows, for Linux to have easy access.
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