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10.4: How to enable booting from multiple clones
Authored by: johnsawyercjs on Nov 02, '07 01:12:22PM

Whenever I buy a pre-formatted drive, that's been formatted as a Windows volume, but which I don't plan to use under Windows, I use Disk Utility to erase (and optionally partition) the drive before I start putting Mac files onto it. Disk Utility's default for erasing a drive, is Mac OS Extended (Journaled). That would take care of the issue discussed here.



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10.4: How to enable booting from multiple clones
Authored by: barryjaylevine on Nov 02, '07 10:17:18PM
Actually, "MacOS Extended (Journaled)" has nothing to do with what is being discussed here. We're discussing the partitioning of the drive and that requires the GUID scheme is you intend to boot an Intel Mac with the subject drive.

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Two things in this world aren't overrated: Macintosh and Lemon Meringue Pie.

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10.4: How to enable booting from multiple clones
Authored by: johnsawyercjs on Nov 04, '07 05:46:58PM

A straight erase of the hinter's drive, in Disk Utility's "Erase" tab, while leaving the default option for Mac OS (Extended) selected, would have changed the volume's partitioning to APM or GUID, and so would have fixed the hinter's problem, but without giving him control over whether the volume was APM or GUID. The hinter doesn't mention whether he was using his drive with an Intel or PPC Mac, so we don't know if he needed to choose between APM or GUID, but it seems that Disk Utility's Partition tab will kill two birds with one stone, if necessary (both reformatting the volume, and letting you select the type of partitioning). As mpanighetti says above, Disk Utility's Erase option will pick the volume format appropriate for booting the Mac model that it's being run on--APM for PPC, and GUID for Intel--it has to choose one or the other, since there's no MS-DOS/Master Boot Record form of Mac OS (Extended)--so an erase as a Mac OS (Extended) volume would probably have given the hinter just what he needed.



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