If the drive doesn't show up in your file manager (grayed if not mounted) you can edit /etc/fstab to mount it.
Here is an example of mounting a Windows drive internally:
Code:
# /dev/sda1
UUID=12a345b6-1234-5abc-6d78-9e01abcde2fg / ext4 rw,relatime,data=ordered 0 1
# /dev/sdb1
UUID=12a345b6-1234-5abc-6d78-9e01abcde2fg /home ext4 rw,relatime,data=ordered 0 2
# /dev/sdc1
UUID=12a345b6-1234-5abc-6d78-9e01abcde2fg /home/me/Music ext4 rw,relatime,data=ordered 0 2
# /dev/sdc2
UUID=12a345b6-1234-5abc-6d78-9e01abcde2fg /home/me/Videos ext4 rw,relatime,data=ordered 0 2
# /dev/sdd1
UUID=12a345b6-1234-5abc-6d78-9e01abcde2fg /mnt/rootbkp ext4 rw,relatime,data=ordered 0 2
# /dev/sdd2
UUID=12a345b6-1234-5abc-6d78-9e01abcde2fg /mnt/homebkp ext4 rw,relatime,data=ordered 0 2
# /dev/sde2 (Windows)
UUID=1234A5BC67C89D0E /home/me/Documents/Windows ntfs-3g uid=me,gid=sambashare 0 0
if you want it to mount always when you boot, otherwise you can run
to find out what device it is in Linux. Then mount it via command line.
You might need to install the ntfs-3g software in Linux (or equivalent) for accessing NTFS drives too. Now if you decide to use this fstab method, you'll obviously need to know your drives UUID's