It will delete it all, yes.
http://www.macyourself.com/2012/03/1...compatibility/
The sum of it all is basically,
HFS+ (Mac OSX Extended) only works with Mac.
NFTS is read/write on PC but only read on Mac, so you can't transfer from Mac to PC.
FAT-32 works with PC and Mac, but is limited to file sizes of 4GB and if formatted on a PC can only have a partion of 32GB, but 2TB on Mac... but that 4GB file size is a buzz kill...
and then their is exFAT, which is better as it doesn't have that 4GB limit OR any overall partion limit, however it only works on newer versions of Mac & PC operating systems, so it works on....
Windows XP SP3
Windows Vista SP1
Windows 7
Any Mac running Snow Leopard 10.6.5 (and newer) and Snow Lion 10.7
Heopfully that clears it ALL up.
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