How to do formatting external disk ? compatible for both mac and windows? mac type OSX 10.9.2 & mac pro OSX 10.5
Is this a New disk?
Then use Disk Utility (in Applications/Utilities):
Partition as 2 Partitions, select [Options], then GUID.
Format Partiton2 as FAT32 (any single file cannot be > 4g) or exFat:
Select [Apply] (All data on the drive will be erased)
Retrieving data ...