Is this a joke? All you have to do is to connect the USB cable to your Mac and that’s it…right?
Well, not quite unless your external hard drive is pre-formatted as Mac OS Extended / FAT32. Since most external hard drives are pre-formatted as NTFS; Mac OS X can only read data from the hard drive; but it can’t write anything to it (unless you install other 3rd party software. I didn’t know this until I got an external hard drive a few months ago, and my friends have been asking me the same questions lately, so I thought it might be a good idea to put it on my blog so that others who got the same situation can solve the problem without calling their friends / technicians :D
Here is how to format your new external hard drive so that you can use it on your Mac:
Step 0. Connect your external hard drive to your Mac.
Step 4. Choose the Erase tab on the right hand side of the screen, then choose the Volume Format you want. If you are using Macs only, then choosing Mac OS Extended (Journaled) would be good. If you got PCs around or you want PCs to be able to connect to your external hard drive, then the MS-DOS(FAT) is the one you want. (it formats the hard drive to FAT32).
Step 5. Click on the Erase button to format the hard drive. After that, you should be able to connect your new external hard drive to your Mac and being able to read and write data to it :D