I have migrated from Windows to Ubuntu very recently. In Windows I had 3 drives and I am using the same here. I have installed my OS in one. I can't read/write or remove files/directories from either of the other two drives.
root@vishnu-desktop:~# sudo fdisk -l
Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xa3e0317f
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 206847 204800 100M 7 HPFS/NTFS/exFAT
/dev/sda2 206848 314572799 314365952 149.9G 83 Linux
/dev/sda3 314572800 1363148799 1048576000 500G 7 HPFS/NTFS/exFAT
/dev/sda4 1363148800 3907026943 2543878144 1.2T 7 HPFS/NTFS/exFAT
In the above /dev/sda2 is where I have installed Ubuntu.
In /dev/sda3 and /dev/sda4 I am unable to do anything.