Question: how to transfer data from iphone to external hard disk?
Answer: Step 1: Connect Your External Hard Drive To Your Mac. First, connect the hard drive to your Mac and make sure it shows up in the Finder's sidebar. ... 
Step 2: Connect Your iOS Device To Your Mac. ... 
Step 3: Launch Image Capture. ... 
Step 4: Select Destination. ... 
Step 5: Click Import.