Why is my drive so slow?

I have a WD 1TB My Book Essential, and an older IO-Mega 320GB external drive.

The WD is connected to a USB 3 port on my computer, but with a USB 2 cable, so I should get 480 Mb/s.

The IO-Mega is USB 2, and connected via a USB hub.  It’s rated at 480 Mb/s.

I run a montly backup, one after the other to both drives.  It was about 75GB today.

Backing up to the IO-Mega took 1 hour and 20 minutes.

Backing up to the WD took 3 hours and 58 minutes.

Any ideas?

Hi,

What is the transfer rate that you are getting?

Are you able ro run a test on the unit using the WD DLG tool.

For detailed information on how to do the test, please see the link below.

http://wdc.custhelp.com/app/answers/detail/a_id/940/session/L3RpbWUvMTQwMTkxMTU2NC9zaWQvVHk1NFctVmw%3D