HT4718 My macbook air show notification "HDD lock". I can't install MacOSX on Partition. Why ?

i have a Macbook Air Mid-2012, system is error.
I want reinstall this mac, but this show "HDD lock" notification. ican't reinstall Moutain Lion on this.
My Macbook Air: S/N C0*******RVC
<Edited by Host>

I finally did it. In fact, if the DVD wasn't readable by OS X after the burning, he was readable by rEFIt on the superdrive. Me (OS X Lion 4 on a MacBook Air late 2011) and a friend (OS X Mountain Lion 1 on a MacBook Pro of 2008) did it this way :
1. Download the Ubuntu iso named "ubuntu-12.04.1-desktop-amd64.iso".
2. Burn it on a blank DVD with the disk utility.
3. Make a partition for Ubuntu with the disk utility.
4. Install rEFIt.
5. Restart the Mac.
6. Select the icon of Tux behind a little disc.
7. Try Ubuntu from the disc.
8. While trying Ubuntu on the disc, use the installer to install Ubuntu. NOTE: NE CAREFUL WHILE INSTALLING UBUNTU, IF YOU CHOOSE THE WRONG OPTION AT A MOMENT OF THE INSTALLATION YOU CAN ERASE OS X.
9. After the installation, Ubuntu should tell you that you might restart the computer. Restart the Mac, and you'll arrive on the rEFIt menu.
10. You can now use Ubuntu on your Mac, enjoy.
We both did it and it worked well, I even reinstalled Ubuntu and it worked well again. Just be careful while installing Ubunut, I'll maybe repeat myself but choosing the wrong option could suppress OS X. Except if you just want a MacBook Air with Ubuntu for the weight… Have a nice day.
Message was edited by: Subs_255

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