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Toshiba external hard drive not recognised

297 Views 4 Replies Latest reply: Apr 11, 2013 4:46 PM by Eustace Mendis RSS
Jona1969 Calculating status...
Currently Being Moderated
Dec 31, 2012 11:11 AM

I have tried connecting my Toshiba 1TB external hard drive to my MacbookPro 2.5ghz but it will not recognise it with finder or disc utility? Also it has a blue power light instead of the normal white one when plugged intop a PC. Any ideas? are these not compatible with mac's?





MacBook Pro, OS X Mountain Lion (10.8.2)
  • Eustace Mendis Level 7 Level 7 (24,600 points)
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    Apr 11, 2013 8:48 AM (in response to Jona1969)

    Is this a USB drive connected with a USB cable?


    There should be no compatibiity problem, but there may be a problem of providing enough power from the USB port. Are there any other USB devices plugged in to the MBP?


    The forums are moderated by Apple employees.

  • CaptH Level 1 Level 1 (35 points)
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    Apr 11, 2013 4:34 PM (in response to Jona1969)

    Here's a link I came across for anyone interested:



    It goes over the symptoms of hard drive problems including "not seen." It also references other stuff that may be of use to you.


    Regarding compatibility, theoretically any USB or FireWire drive should be "plug and play" unless you ended up installing a third party vendor set of device drivers etc. that aren't compatible. This was (and might still be) a problem with some of the Seagate external drives when using Mountain Lion. I know Seagate offered some updated software kits to fix at least some of the problems.


    As Eustace said, some external USB drives need adequate power, and if the USB port can't provide it, on some units it will "sort of" look like its on but it actually isn't. I bought a cheap USB enclosure and it comes with two cables because it needs two ports. WIthout using 2 ports it will look like it's on but it's not really functional...then again it cost 5 bucks so I guess I shouldn't be too surprise! ;-)

  • Eustace Mendis Level 7 Level 7 (24,600 points)
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    Apr 11, 2013 4:46 PM (in response to CaptH)

    Thank you very much - great link. Just skimmed it, but have it saved for later.


    For many years now I have used a powered usb hub with each of my Macs. The hub is plugged into the wall for power, and connected to the Mac for data. All USB devices are plugged into the hub for power and data flows through the hub.


    I first did this because it such was a **** nuisance to keep reaching behind a huge tower to find an empty usb port. My main computer's usb hub has a printer, a scanner, a keyboard, a mouse and two camera cables connected all the time.


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