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  #16  
Old 07-09-2010, 04:14 PM
Jimmy1 Jimmy1 is offline
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So, anything about streaming internet radio in the user guide?

Also, Web TV is Euro-only, correct?

  #17  
Old 07-09-2010, 09:06 PM
cylon6 cylon6 is offline
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Hmmm. Looks like when composing an email you can't change font or colour of the text. Shame.

  #18  
Old 08-09-2010, 03:39 AM
duncan_mcdougal
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Usb otg

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Originally Posted by Unregistered View Post
Quote:Originally Posted by Unregistered
I like the bit about how to write a shopping list using Notes on page 93. Nokia had better remember to advertise this killer feature!


There is some information on using USB OTG that I've been waiting for though. It says:

"If you connect a hard drive that requires more than 200 mA of power, use an external
power source for the hard drive."

Does anyone have any idea how much current is needed by a typical 2.5" or 1.8" portable USB drive? It would be very nice to carry hundreds of gigabytes of storage around for less than the cost of a 32GB MiceoSD card, but they don't usually have an external power supply option.

USB 2.0 allows for up to 500mA current draw, which is not very much at 5V (because current is inverse proportion to voltage in power calculations). I would suggest that any device with a spindle rotating at high rpm is going to take more than 200mA at 5V. Some probably more than 500mA.
If the N8 has a 5V usb connector it can provide up to 1V. This means it could theoretically power some 2.5" drives. This list shows some drive using under 1V for HD video playback.

  #19  
Old 08-09-2010, 03:41 AM
duncan_mcdougal
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opps!

Quote:
Originally Posted by duncan_mcdougal View Post
If the N8 has a 5V usb connector it can provide up to 1V. This means it could theoretically power some 2.5" drives. This list shows some drive using under 1V for HD video playback.
Forgot the link.

http://www.tomshardware.com/reviews/...ve,2548-8.html
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  #20  
Old 08-09-2010, 09:31 AM
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Quote:
Originally Posted by duncan_mcdougal View Post
If the N8 has a 5V usb connector it can provide up to 1V. This means it could theoretically power some 2.5" drives. This list shows some drive using under 1V for HD video playback.
The lowest power consumption on that page for streaming read operation is 2.2W, which gives a current draw of 440mA at 5V. OK for desktop USB2 but too much for the N8 OTG port without an external power source.

  #21  
Old 08-09-2010, 03:08 PM
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Thanks guys for doing the number crunching to answer my UDB OTG power question! Sounds like buying a small portable hard disk would be a bit of a gamble, unless some are found that states how much current they need in the product description before making a purchase.

Since USB OTG is such a new concept for a phone, maybe portable storage manufacturers and retailers will address this concern in the near future.

  #22  
Old 08-09-2010, 04:39 PM
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Quote:
Originally Posted by Unregistered View Post
Thanks guys for doing the number crunching to answer my UDB OTG power question! Sounds like buying a small portable hard disk would be a bit of a gamble, unless some are found that states how much current they need in the product description before making a purchase.

Since USB OTG is such a new concept for a phone, maybe portable storage manufacturers and retailers will address this concern in the near future.
Another way of looking at it:

If you draw 200mA through the USB, then a perfect fully charged 1300mAH battery will drain in 6.5 hours not including all the other work it will need to do. So, if you could sustain the full USB2 spec 500mA then the battery would last only 2.3 hours not including all the other stuff it has to do.
 

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