Auto Mount Drives at System Startup
Ubuntu is capable of reading and writing files stored on Windows formatted partitions, but partitions must be 'mounted' before they can be accessed each time you start up the system. With these steps, you can auto mount the drives or partitions without the need to manually mount them for access.
Install Storage Device Manager if it has not been added.
Go to Applications (or Main Menu) > Ubuntu Software Center.
Enter pysdm in the Search Box.
Select Storage Device Manager, click the "Install" button.
Go to System > Administration > Storage Device Manager.
Extend the list of sda and select the sda you want to auto mount, click 'OK' to configure.
Click the "Assistant" button.
Uncheck "Mount file system in read only mode" and keep "The file system is mounted at boot time" checked.
Click the "Mount", "Apply" then "Close" button, and restart the system.
In case you wish to remove the auto-mount of a certain drive or partition, you can similarly use Storage Device Manager to do the setting.
If you need to identify disk partitions by label, paste ls /dev/disk/by-label -g in Terminal, or to view partition sizes and file systems, enter sudo fdisk -l. Disk Utility mentioned in "Name or Label a Partition" also gives you a glance of device numbers, partition types, sizes and labels.