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MYmacROX

 
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Member Since: Mar 17, 2009
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Mac Specs: 2008 15" MBP ML, 2012 21.5" iMac ML

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Quote:
Originally Posted by doug2484 View Post
my external hdd is supposed to be formatted for both pc and mac. so it said before purchase.
There's a difference between the way it is formatted right now (both Mac and Windows can read and write to it) and the way Time Machine requires it to be formatted to do its backups. If you plant to use Time Machine (comes with your Mac) to backup your Mac, then you'll have to partition the external and format it to MacOS Extended (Journaled). It has to do with Time Machine. You can leave it as-is if you want to manually backup or copy data to your external without using Time Machine.
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