External hard drives are a great way to backup important data, add storage to a computer such as a laptop that cannot be upgraded easily or for sharing data between computers. Over the last few years the cost of them has come down dramatically and the capacity has gone up.
Usually, external hard drives are connected to a computer using a USB connection with smaller, portable drives being able to be powered by the USB cable, while larger drives need their own power supply. External hard drives have much larger capacities than USB Flash Drives, but are more susceptible to damage as they contain a spinning disk
These are the current Top 5 Best Selling External Hard Drives at the moment and this list is updated regularly.
Western Digital My Passport Essential SE 1 TB USB 3.0 Portable External Hard Drive (Black)
by Western Digital
504 days in the top 100
Platform: 
Windows
(951)
Buy new: $229.99 Click to see price
62 used & new from $119.58
Western Digital WD Elements 2 TB USB 2.0 Desktop External Hard Drive
by Western Digital
723 days in the top 100
(2435)
Buy new: $179.99 Click to see price
46 used & new from $119.09
Western Digital WD Elements 1 TB USB 2.0 Desktop External Hard Drive WDBAAU0010HBK-NESN
by Western Digital 
741 days in the top 100
(2435)
Buy new: $129.99 Click to see price
35 used & new from $98.99
Western Digital My Passport Essential SE 750 GB USB 3.0/2.0 Ultra Portable External Hard Drive (Black)
by Western Digital 469 days in the top 100
(951)
Buy new: $159.99 $89.99
57 used & new from $80.99
Western Digital My Passport Essential SE 1 TB USB 3.0/2.0 Ultra Portable External Hard Drive (Metallic Blue)
by Western Digital 
372 days in the top 100
(951)
Buy new: $229.99 $129.99
8 used & new from $119.99
