How to access USB External Drive on iMac from Macbook Pro? I have an iMac with an external USB 1TB harddrive, running Mountain Lion. Under File Sharing I have added this external drive to my list of "Shared Folders".

I have a MacBook Pro also running Mountain Lion and I want to be able to access the external drive on the iMac, but it's not showing that drive when I access the iMac via Finder on the MacBook Pro.

What am I doing wrong?
I've realised that all the time the external drive is NTFS file system, it won't share it, but as soon as I formatted it to Mac OS Journalled FS, it appeared straight away.