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#153886 11-Oct-2014 12:58
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When I put in a flash drive for example in my iMac ( late 2011 running Mavericks) other drives will spontaneously disconnect with the accompanying message they have been removed incorrectly. These include powered drives like WD or Seagate.
Any ideas why this should happen? I have Googled without success. 




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gzt

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  #1151804 11-Oct-2014 13:09
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Any flash drive or one particular type flash drive?

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  #1151820 11-Oct-2014 13:16
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Exceeding the total power draw for all the devices perhaps. Some devices require more than the 500mA standard current, which the iMac will supply, but probably not to all devices at the same time. Try Apple Menu -> about -> More Info -> System Report -> USB to see the power requirements of each device.

 
 
 
 


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  #1151821 11-Oct-2014 13:16
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Also try different combinations of your external hdd drives to find out if one might be spitting the dummy on the rest for some reason.

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  #1151822 11-Oct-2014 13:18
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  #1151827 11-Oct-2014 13:43
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I am not using any proprietary dive software. It is any combination of drives. It has 4 ports, most recent had one powered drive plugged in s WD 2TB then plugged in a 16 gb flash drive and the WD immediately disconnected




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  #1151832 11-Oct-2014 14:16
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RunningMan: Exceeding the total power draw for all the devices perhaps. Some devices require more than the 500mA standard current, which the iMac will supply, but probably not to all devices at the same time. Try Apple Menu -> about -> More Info -> System Report -> USB to see the power requirements of each device.



The two external powered drives report they require 0 power of the 500 USB allocation




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  #1151968 11-Oct-2014 20:12
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I disabled the built in Facetime camera and this may have stopped it happening,




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