osx split external hard drive partition

Posted by Bart on Super User See other posts from Super User or by Bart
Published on 2011-03-11T15:30:10Z Indexed on 2011/03/11 16:12 UTC
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Hi, I currently have a 640GB external HD that has 1 partition formatted as HSF+ Now I want to split some of the free space into a new FAT32 partition, without having to reformat the whole HD and losing all my data. I read that I'm supposed to be able to add new partitions in the Hard Disc Utility by clicking the "+" sign, without any loss of data. But in my case the "+" is not clickable and it says that this partition cannot be altered.

Can anyone tell me how to proceed. Or is it impossible without reformatting the whole disc?

Thanks

ps: I'm running osx snow leopard 10.6.6

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