750GB External Portable 2.5" USB Hard Drive needs to added drive letter for open

HI Experts
750GB External Portable 2.5" USB Hard Drive can not be opened sometimes or ofern needs to be added drive letter. The laptop PC is windows 7. It looks like that my pc can not provide power to the Drive. Any experts have idea for that ? Thank you.
EESkyAsked:
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dbruntonQuid, Me Anxius Sum?Commented:
>>  It looks like that my pc can not provide power to the Drive.

A powered external USB hub can fix that problem.  For example http://www.amazon.com/Belkin-4-Port-Cable-Power-Supply/dp/B00004Z6KW is one but you should be able to find something similar at any computer retailer.

Try that first and if problems persist post back.  It may be just a matter of assigning a drive automatically to the drive on connection.
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nobusCommented:
wow - i would not buy it - it says :  Data Transfer Rate - 12 Mbps
that's USB 1 still,; i would look nowadays for an USB 3 device :
http://www.amazon.co.uk/dp/B009EX24T4?gclid=CJGLsPPmx7kCFbHItAodp3UADQ
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terencinoCommented:
EEsky can you tell us the model of the laptop and external drive?
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nobusCommented:
EESky - why the Cgrade?  without a comment?
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