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I just installed 11.10 on my Lenovo z570 with 750GB HDD via a USB. After the installation when I turn the computer on I don't get an option to choose the operating system and when I check the HDD in windows it will state the hard drive is 370GB instead of 750.

The installation ate away 300 GB.

2 Answers 2

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You can also use Boot-Repair, it will auto repair and fix the existing OS boot. Type this in terminal:

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update && sudo apt-get install -y boot-repair && boot-repair

Boot-Repair can be installed & used from any Ubuntu session (normal session, or live-CD, or live-USB). PPA packages are available for Ubuntu 10.04, 10.10, 11.04 and 11.10.

Using Boot-Repair

gksu boot-repair

Then try "Recommended repair" button. When repair is finished, reboot and check if you recovered access to your OSs.

The option "Recommended repair" will auto search existing boot OS and will auto fix the boot records.

For more option, you can set, look at the GUI interface: https://help.ubuntu.com/community/Boot-Repair

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A quick fix for many dual boot problems is updating your Grub (Grub is the bootloader - GRand Unified Bootloader)

Try this:

  1. Open a terminal by pressing ctrl+alt+t or open your unity dash and start typing "terminal"
  2. Type/copy:

    sudo update-grub
    

That should add the windows entry, let us know if not and we'll try some other options.

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