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I have a two hard drives, 465GB each. I have windows on one, and wish to install Ubuntu on the other through Wubi. Also, I have 16 GB RAM.

When I installed Ubuntu, the acutal space in the home directory was very low. How do I partition, in order to utilize all the 465 GB of my hard drive?

Also, can I utilize all 16 GB for either Windows or Ubuntu (coz I never run both simultaneouly)

Appreciate your help!

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up vote 2 down vote accepted

To fully utilize your second hard drive for Ubuntu you should use a full install from a live CD/USB rather than a WUBI install. WUBI will put Ubuntu in a virtual partition in a big file inside Windows partition. Even though WUBI is easier as you don't have to partition your hard drive, it has some disadvantages. For example, if the Windows partition gets corrupted, Ubuntu won't boot.

As with full install and WUBI install, you can only use either Ubuntu or Windows at any time. You will be able to choose between Ubuntu and Windows every time you boot the computer. To switch between the two you have to reboot the computer and choose the other OS.


  1. First download the ISO file then burn it to a CD/DVD or use Unetbootin to get a bootable USB, select the Installation media to boot first from your BIOS.
  2. Once you're in the Live Session, choose Install Ubuntu.
  3. When you get to the Choose an Option screen, select Do Something Else.
  4. Locate the Second drive and choose to Install the System on the second drive.
  5. Choose to also install the bootloader on the 2nd drive, make sure it's the drive and not a partition (i.e. /dev/sdb and not /dev/sdb1). I am assuming sdb is your second hard drive. It may not be, check to be sure.
  6. Set the BIOS to boot from the UBUNTU hard drive first, and Windows second.
  7. Boot Ubuntu and open a terminal by pressing Ctrl+Alt+T and type sudo update-grub

The last step should find the Windows in the first drive and update Grub accordingly and from next boot,you should be able to choose between Ubuntu and Windows.

See How to install ubuntu on a second hard drive with windows being on the first?


I recommend you make

  1. One 30GB / partition format ext4
  2. One 4GB Swap partition format Linux/Swap
  3. Rest of the drive as /home partition format ext4


Ubuntu should be able to use all the RAM irrespective of your choice of 32bit (PAE) or 64bit version. The AMD64 will be more efficient. With 16GB RAM you may not need to swap much. But Ubuntu will be happier with a Swap partition.

Hope this helps

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Thanks for your help! I was able to do it successfully until step 6. However, the BIOS bootsequence was not showing the option to select the hard drive to boot from. The steps I followed - F12 - bootsequence - up/down arrows to select the device to boot (hard drive not showing up there!) Really appreciate if you could elaborate on this.. Thanks!! – user98118 Oct 19 '12 at 20:07
You have to go inside BIOS and change the settings permanently. This varies by computer. It may be F2, Esc, or the Del or some other key. You have to press this key at the when you press F12 to temporarily change the boot order. Once inside BIOS, look for the boot tab or something similar. – user68186 Oct 19 '12 at 20:14

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