Mac osx lion on USB or CD

Question

I get my macbook pro without cd ,(2011 cd is not included)
1-how to burn a Mac osx on USB (without having a installer).
2-If i erase the OSX can i install the OSX from the internet (apple server) .
THX

Answer 1

Your model uses Internet Recovery rather than physical media: OS X Lion- About OS X Recovery and OS X (Lion/Mountain Lion)- About OS X Recovery. You can erase the hard drive and reinstall:
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.
Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
If is possible to create your own bootable USB flash drive, but in order to do so you must download and save a Lion or Mountain Lion installer application. It must be a version that will boot your model:
Unfortunately, the link for getting specific hardware versions has disappeared. So basically:
Get yourself a spare hard drive freshly erased or with a freshly erased partition of around 8 GBs or more.
Boot to your Recovery HD. Select Reinstall Lion from the main menu.
From the beginning screen select your spare partition/drive as the target destination then begin the download.
At the end of the download you will observe an Install button for you to click. Now this is important - as soon as that gadget appears you must abort the installation process. There are only two reliable ways to do this quickly: a. yank the cable for the drive from the computer; b. pull the power on the computer - shut it down quickly.
This will result in your finding a folder on the drive that contains InstallESD.dmg that you can now use to create a bootable USB flash drive installer based on the special build for your model. Use it until the next public release of Lion appears or you move on to Mountain Lion.
If you do not stop the download process immediately upon its completion you will end up with an installer that always boots to a non-functioning installation progress window instead of the normal main menu.
Make Your Own Mountain/Lion Installer
1. After downloading Mountain/Lion you must first save the Install Mac OS X Mountain/Lion application. After Mountain/Lion downloads DO NOT click on the Install button. Go to your Applications folder and make a copy of the Mountain/Lion installer. Move the copy into your Downloads folder. Now you can click on the Install button. You must do this because the installer deletes itself automatically when it finishes installing.
2. Get a USB flash drive that is at least 8 GBs. Prep this flash drive as follows:
Open Disk Utility in your Utilities folder.
After DU loads select your flash drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
Click on the Erase button. The format process can take up to an hour depending upon the flash drive size.
3. Locate the saved Mountain/Lion installer in your Downloads folder. CTRL- or RIGHT-click on the installer and select Show Package Contents from the contextual menu. Double-click on the Contents folder to open it. Double-click on the SharedSupport folder. In this folder you will see a disc image named InstallESD.dmg.
4. Plug in your freshly prepared USB flash drive. You are going to clone the content of the InstallESD.dmg disc image to the flash drive as follows:
Double-click on the InstallESD.dmg file to mount it on your Desktop.
Open Disk Utility.
Select the USB flash drive from the left side list.
Click on the Restore tab in the DU main window.
Select the USB flash drive volume from the left side list and drag it to the Destination entry field.
Drag the mounted disc icon from the Desktop into the Source entry field.
Double-check you got it right, then click on the Restore button.
When the clone is completed you have a fully bootable installer that you can use without having to re-download Mountain/Lion.
Note: The term Mountain/Lion used above means Lion or Mountain Lion.
As an alternative to the above you can try using Lion DiskMaker 2.0 that automates the process.