On 12/03/13 13:23, James Harper wrote:
>>
>> On 12/03/13 12:06, James Harper wrote:
>>
>>> . something else
>>
>> Kernel bug (not saying it is here, just that it's always a possibility).
>>
>
> The reason I haven't made that assumption is that the previous 500GB disks 
> still work fine.
>
> Any idea how to easily report on USB power usage?
>
> It wouldn't be the first time a device has lied about its current draw or an 
> adapter has lied about its ability to supply an amount of power.

You aren't kidding!  I've got an Hitachi 1TB USB3 plugged in to a USB2 
port, and lsusb reports:
   idVendor           0x4971 SimpleTech
   idProduct          0x1014
   bcdDevice            0.00
   iManufacturer          10 HitachiGST
   iProduct               11 Touro Mobile 3.0
...
   MaxPower                8mA
...
   Device Status:     0x0001
       Self Powered

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