Should I power the original HDD from a secondary USB when used externally ?

Discussion in 'Mac Basics and Help' started by XPcentric, Aug 15, 2014.

  1. XPcentric, Aug 15, 2014
    Last edited: Aug 15, 2014

    XPcentric macrumors 6502

    Oct 16, 2008
    I changed my original Toshiba HDD on a Macbook because it was moving too slow and load cycle count was too high. Now I was trying to use this HDD as external using a cheap USB Sata adapter. However, I'm able to browse the content for a little time, but it gets disconnected too quick and this loop keeps going.

    I wonder if I should try to use the additional USB part of the cable to power it of if I should not even take the risk. The original HDD requires only 5V, 1A I dont think the HDD is the problem here.

    edit: I just observed that OSX support is not even mentioned on eBay products page and only windows, but I was able to view the content for a short time.
  2. Bruno09, Aug 15, 2014
    Last edited: Aug 15, 2014

    Bruno09 macrumors 68020

    Aug 24, 2013
    Far from here
    Someone will correct me if I am wrong :

    A computer's USB port can deliver a 500 mA (0.5A) maximum current.

    Therefore, you need two USB ports to power this external drive.
  3. XPcentric thread starter macrumors 6502

    Oct 16, 2008
    Thank you Bruno09!

    I took the risk and plugged the other USB part to power it, and something changed. It did finally work longer for what I was trying to do but still got disconnected. Basically I used Path Finder in List View and checked to Calculate all files sizes. It took long and it managed to calculate all folder sizes in root '/', but then when I tried to open a subfolder, it didnt calculate the size of files in it and it got disconnected.

    It might be because of the old HDD or because of the power not being enough even when powered with two USB slots, I still dont know. The following article I discovered says that not all USB ports deliver the same power, and that makes it even trickier:

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