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[Q] Nexus 7 OTG Problem with External HDD

Hello guys
I have Nexus media importer (not rooted) and when i connect usb stick its working fine but when i connect my external hdd WD 320gb its not working. Anyone knows what could be the problem ? maybe lack of power ? waiting for answers :highfive:

You can connect only device with own power source...

It is possible to use a hub with otg, I have connected a kboard and mouse through a basic 4 port hub as a tester. You should be able to use a powered hub to drive your external HD
Sent from my Nexus 7 using Tapatalk HD

So which do you think is the problem?
Sent from my Nexus 7 using xda app-developers app

Both the other posters indicated it is likely a power problem. But, not all external HD's will work, powered or not. My WD 750Gb My Passport HD won't mount even powered.

It is indeed a power problem. My usb 2.0 based wd1600 did the same. Since it does not have its own power source, i wired in 5 volts to its usb cable and that got me up and going. There are some usb 3.0 ext hdds that dont need external power to work though. Tassadar got one and said it runs fine with just the power provided by the n7. So you have 3 options. 1. Use an hdd with ext power. 2. Wire in 5 volts to the cable. 3. Purchase an hdd which the n7 can power.
Sent from my Nexus 7 using xda premium

How can I wire 5v power? You mean by hub with power input?
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Necronhyperion said:
How can I wire 5v power? You mean by hub with power input?
Sent from my Nexus 7 using xda app-developers app
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No. I actually spliced a 5 volt power adapter directly into the hdds usb cable (red and black wires). A little solder and a few heatshrinks are priceless.
I was going to upload a pic of the cord, but uploading anything with the xda app is beyond retarded anymore. Startimg to regret paying for the premium. For the greatest android site on the web, it is a shame that their app stinks and riddled with bugs. Kinda ironic.
Edit:Uploaded with a browser.
Sent from my screaming Nexus 7, multibooting Ubuntu-Plasma-bodhi-paranoid-rasbeanjelly-cleanrom-and stock.

Thank you very much.you helped me a lot
Sent from my Nexus 7 using xda app-developers app

is a 3volt (50hz 5w) charger enough for a power usb hub to use on an android stick?

i found a usb hub i had, but i couldnt find a charger, but i have managed to find a sony charger i had which powers the hub its 3volt 500ma output? is this safe to use to power other accessories to use on the device (mx2)

Probably not. What kind of stick?
Sent from my Nexus 7 using Tapatalk HD

imito mx2
what voltage would i need?

I believe you'll want 5v
Sent from my Nexus 7 using Tapatalk HD

What's the difference with the extra plug in the new USB cable included with Note 3?

What does the extra plug do?
Just faster transfer speed or faster charge using USB 3.0?
I tested it with a standard USB 2.0 microUSB cable and it still works and charge the Notes 3

It dedicated in/out. Much faster charging and data bandwith
Sent from my SM-N900T using XDA Premium 4 mobile app

From what I've heard and read USB 3.0 doesn't charge faster. But it transfers days about twice as fast as USB 2. But don't quote me on that. ..
Sent from my SAMSUNG-SM-N900A using xda app-developers app

True, doesn't charge faster from the wall, but will when plugged into a USB 3.0 port on a computer when compared to USB 2.0 port.
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itsjusttim said:
True, doesn't charge faster from the wall, but will when plugged into a USB 3.0 port on a computer when compared to USB 2.0 port.
Sent from my SM-N900T using XDA Premium 4 mobile app
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Click to collapse
I tested this, and it seems to charge at the same rate in a USB 3.0 port, plus it stopped charging after a few minutes. The port is a PCI Express card from Rocketfish.
Now I'm starting to doubt the accuracy of the app or my understanding of what it does.
It's Galaxy Charging Current Lite. If I launch it while my battery is charged to about 80% it says 460. If I come back & refresh the view when it is charged to 97-98% it says 1800. Why would the rate start slow then speed up as the battery fills, shouldn't it be the other way around?
A few weeks ago I used another app to check charging rates of my Nexus 4 with different cables & chargers, and this app seems to be very different. I guess I need to try to figure out which battery checking app it was.
Sent from my Nexus 10 using xda app-developers app

AllGamer said:
What does the extra plug do?
Just faster transfer speed or faster charge using USB 3.0?
I tested it with a standard USB 2.0 microUSB cable and it still works and charge the Notes 3
Click to expand...
Click to collapse
The charge/data cable, is just a standard USB 3.0 cable, just like any USB 3.0 external harddrive cable. I am actually using a black WD USB 3.0 Cable instead of the ugly white cable supplied.
All the cable does, if you have USB 3.0 on your PC/Laptop is allow for much fast data transfer (great when transferring music or video to and from your phone via usb. Note that you need to select USB 3.0 mode on the phone.

Dock hack

Anyone know how to splice a micro usb cable and attach it to the dock do I can charge my tablet? Charging via micro usb port isn't working and up need a way to charge the device
Sent from my Nexus 5 using XDA Premium 4 mobile app

Samsung 2A charger head degrade?

Hi, is it possible for a charger head to get degraded?
My s5 charger used to to able charge at 2A, but now It can only charger less than 1A using my note 4 ogrinal cables
Sent from my SM-N910F using XDA-Developers mobile app

yea.. wear and tear condition.. try replacing the USB cable (high quality).. and test it again with USB volt meter...

I've had both the adapter and the cable go bad, so you'll have to check both.
Sent from my SM-N910T using Tapatalk

krobar77 said:
yea.. wear and tear condition.. try replacing the USB cable (high quality).. and test it again with USB volt meter...
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Click to collapse
I checked using charger doctor which tells me about the amount of A my charging is giving
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rcobourn said:
I've had both the adapter and the cable go bad, so you'll have to check both.
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What do u meant by 'go bad' ? Do the refused to charge or charge at a very slow rate?
Sent from my SM-N910F using XDA-Developers mobile app

One adapter that would not charge at all, two cables that stopped doing fast charge but would still slow charge.
Sent from my SM-N910T using Tapatalk

See after using galaxy charging current app.