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OS X Lion: Installation Guide, Boot Discs and Q&A
- Thread starter OneMoreThing...
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Every guide for making your own boot volume seems to leave out the important step of making sure your USB drive uses a GUID partition table. I think Lifehacker has the best set of instructions out of what I've seen.
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Disk Utility defaults to GUID. The only time you would ever wish to use MBR instead of GUID is when formatting a flash drive to FAT-32.
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Yes, but there's a decent chance someone doing this would be using a usb drive already formatted FAT32 and MBR since nearly every flash drive comes that way. Plus people often mess up steps in tutorials (might just reformat the one partition because they see the HFS option), so it's an extra layer of fool-proofing.
This brings up an interesting question: Does Disk Utility in Lion allow formatting hard drives to use the old Apple Partition Map?
This brings up an interesting question: Does Disk Utility in Lion allow formatting hard drives to use the old Apple Partition Map?
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And that would be practically every flash drive.
Using the Erase tab option most of the tutorials say to use, does indeed leave the partition table as MBR, even when formatting to HFS. Just did it last night myself.
The installer will still load and run from the desktop. So, it looks like it will still install, "if" you're booted into the OS still on your system. (Not for sure, I'll find out this weekend when I upgrade my wife's machine.) It is not bootable however, and you'll not be able to do a clean install with it.
Using the Erase tab option most of the tutorials say to use, does indeed leave the partition table as MBR, even when formatting to HFS. Just did it last night myself.
The installer will still load and run from the desktop. So, it looks like it will still install, "if" you're booted into the OS still on your system. (Not for sure, I'll find out this weekend when I upgrade my wife's machine.) It is not bootable however, and you'll not be able to do a clean install with it.
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You don't need to erase or format seperately if you just use the Restore tab in Disk Utility.
Just drag the InstallESD.dmg file in as the source and drag the USB drive from the disk utility sidebar as the destination.
It formats, and reimages the USB drive all in one.
Just drag the InstallESD.dmg file in as the source and drag the USB drive from the disk utility sidebar as the destination.
It formats, and reimages the USB drive all in one.
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Unless Apple severely changed the functions of Disk Utility in Lion, I guarantee you restoring to a partition on an MBR-partitioned drive won't make it bootable on Macs.
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