Absolutely new to MAC's and hardly literate in the PC world either. I need an external HD for Lightroom work, lots of files from years and years back. Finally going to get them all in one place and start working on them in Lightroom. A 2-4 TB drive was suggested. Are there drives specifically set up for the Mac OS? I looked at Seagate drives, price is right, etc. But it mentioned not set up for a MAC, would require reformatting. Suggestions on a 2-4 TB drive $150 or so max. Then all I'd need is a usb 3 cable correct? Thank You.