Q. How can I save files from an iMac to my external hard drive?
Your external hard drive is likely not formatted for PC and Mac.
CAUTION: All data on the hard drive will be lost when formatting. Save documents elsewhere, format the drive, then move them back to the hard drive. DO NOT FORMAT A HARD DRIVE UNLESS YOU'RE WILLING TO LOSE ALL FILES.
- Open a new Finder window: click on the desktop to choose Finder then go File > New Finder Window
- Under Macintosh HD choose Applications > Utilities > Disk Utility
- On the left sidebar, select your hard drive.
- Select the Erase tab. Under the Format menu choose MS-DOS (FAT). Click Erase and the disk will reformat.