For Developers Disc Mac OS X

You need to use this version of Startup Disk to select a Mac OS X disk as your startup disk.

Important If you start Classic after installing Mac OS X, Classic installs this version of Startup Disk in the Mac OS 9.1 System Folder it uses.

When asked to select the disk where I want to install Mac OSX no disks are listed.

Was my new hardrive installed incorrectly MacBook Pro, OS X Mountain Lion (10.8).

That indicates to me that the drive has not yet been formatted as Mac OS Extended Journaled, so it is not ready for Lion to install onto it.

This section of the following article will help you get that drive erased and formatted properly so you can continue with the installation: How to reinstall OS X on your Mac.

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For Developers Disc Download Using One

As I explained in our main Lion-installation article, you should be able to force a re-download using one of the following three tricks: First, Optionclick the Buy App button in the Mac App Store.

Unlike previous versions of Mac OS X, Lion (OS X 10.7) doesnt ship on a bootable discits available only as an installer app downloadable from the Mac App Store, and that installer doesnt require a bootable installation disc.

Indeed, this lack of physical media is perhaps the biggest complaint about Lions App Store-only distribution, as there are a good number of reasons you might want a bootable Lion installer, whether it be a DVD, a thumb drive, or an external hard drive.

For example, if you want to install Lion on multiple Macs, a bootable installer drive can be more convenient than downloading or copying the entire Lion installer to each computer.

Also, if your Mac is experiencing problems, a bootable installer drive makes a handy emergency disk.

Lion features a new recovery mode (also called Lion Recovery), but not all installations of Lion get itand if your Macs drive is itself having trouble, recovery mode may not even be available.

Also, if you need to reinstall Lion, recovery mode requires you to download the entire 4GB Lion installer again.) Finally, a bootable installer drive makes it easier to install Lion over Leopard (assuming you have the license to do so).

Thankfully, its easy to create a bootable Lion-install volume from the Lion installer that you download from the Mac App Store; just follow the steps below.

However, unlike with the CD- and DVD-based Mac OS X installers of old, Apple canand doesupdate the Mac App Store version of the Lion installer.

So if you create a bootable Lion-installer drive using the current version of the Lion installerwhich, as of 2102012, installs OS X 10.7.3that drive will work with all current Lion-capable Macs.

If your only Mac was released after Lion, so you cant download the Lion installer from the Mac App Store, Ive also provided instructions for creating a bootable Lion-install drive for newer Macs.

Its called Install Mac OS X Lion.app and it should have been downloaded to Applications.

The next steps depend on whether you want to create a bootable hard drive or flash drive, or a bootable DVD.

I recommend a hard drive or flash drivea DVD will work, but it takes a long time to boot and install.

Follow Steps 1 through 4 in this slideshow to properly format the drive.

Warning: The next step will erase the destination drive or partition, so make sure it doesnt contain any valuable data.

The restore procedure will take anywhere from five to 15 minutes, depending on your Mac and the speed of your drive.

However, with the 10.7.4 installer, you must use the mounted Mac OS X Install ESD volume or you will get an error at the end of the restore procedure and the newly created bootable drive may not function properly.

When prompted, insert a blank DVD (a single-layer disc should work, although you can use a dual-layer disc instead), choose your burn options, and click Burn.

You can now boot any Lion-compatible Mac from this drive or DVD and install Lion.

You can also use any of the Lion installers special recovery and restore features in fact, when you boot from this drive or DVD, youll see the same Mac OS X Utilities screen you get when you boot into restore mode.

Note: As explained in our main Lion-installation article, if you leave the Lion installer in its default location (in Applications ) and use it to install Lion on your Macs startup drive, the installer will be automatically deleted after the installation finishes.

So if you plan to use that installer on other Macs, or to create a bootable disc or drive as explained here, be sure to copy the installer to another driveor at least move it out of the Applications folderbefore you install.

If you dont, youll have to re-download the entire thing from the Mac App Store.

If youve already installed Lionso its too late to move the installeryouve may find that the Mac App Store claims that Lion is already installed and prevents you from downloading it again.

Mac Os X For Developers Install Disc