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I have a machine running OS X 10.5.8, and am upgrading it to Snow Leopard, and then Lion. Snow Leopard requires a Journaled partition, but the partition the OS is running on now is Mac OS Extended — no journaling.

Can I journal the partition without reformatting and losing data?

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Nevermind, my stupid head missed the "Enable Journaling" button in Disk Utility. Problem solved! – delwin May 6 '12 at 15:18

I found the answer myself. Easily. I had simply just missed the "Enable Journaling" button in Disk Utility, sixth from the left in the upper toolbar.

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