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2.5'' SATA drive on USB not getting enough power

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#1 GiantRug


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Posted 01 October 2015 - 08:04 AM

Hello, I just got my hands on a WD Caviar Blue 320GB and bought the cheapest external enclosure I could find along with a type Y USB cable (1 plug for data and power + 1 plug for power). To my disappointment when I plugged it into a USB hub (Amazon Basics 7 port USB 3.0 hub with power adapter) nothing happened... Plugging it into 2 ports in the back of my computer had somewhat of an effect - the drive starts to spin but clicks and stops, it's not being detected by the system so I guess it's getting some power but not enough :( Surprisingly when I plugged it into my Samsung laptop it worked just fine, so I'm guessing everything is set up correctly, it's just my mobo not giving enough power to the USB ports? How can I fix this? I thought hubs with power adapters should be equipped to handle 1000mA? Thanks!

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#2 Chris Cosgrove

Chris Cosgrove

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Posted 13 October 2015 - 06:15 PM

First of all - welcome to BC !




These are WD's specs for this range of drives, yours are on page 3. According to the specs peak current demand at 12V is 1.77A (1770mA) which equates to 21.24W although the average power requirements are only 6W while doing read/writes, which equates to 500mA (0.5A).


It may be that the port you are using on the laptop is a 'charging' port, one which provides more power for charging things like mobile phones. I think your guess is correct, it is not getting enough power the way you want to use it from your desktop and hub. I think you are going to have to spend a little time on the WD web-site to discover how to power this drive properly.


Chris Cosgrove

Edited by Chris Cosgrove, 13 October 2015 - 06:15 PM.

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