I want to create a second a partition in my hard disk where one (about 900 GB) is used for Time Machine and another (100 GB) is used to store info like a thumb drive.
I don't want any existing data to be lost. I know someone who partitioned his hard drive and it is now spoiled and not repairable. I have important info in this hard drive and this is my only one.
For your info, I am using a retina MacBook Pro with Mavericks and want to repartition a WD My Passport for Mac hard disk.