Ok nevermind.
I managed to solve this problem on my own. LOL :laughing:
I thought the drive can’t be unmount, this would be generally be associated with drivers and/or applications utilizing it.
So here’s I resolve the issue.
I reboot my Mac Yosemite 10.10.2 into recovery mode (Hold CMD+R when powering up). That’s where use the Disk Utility as usual. This time round, partition was successful. Restart my OS and my new HDD is working.
Happy man now! =D
I hope this will help someone with the same issue as me.
Cheers!!
