Dual Input USB power cable
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Resolve problems with inadequate power from USB port. If your Notebook computer provides minimal power from the USB port but happens to have two USB ports available, the Dual Inputs USB power cable may be your solution to achieve true portability. This power cable combines the power of two USB ports and enables most of the low power notebook computers to power any USB external device. It is simple to install. Plug both USB connectors into the two USB ports of your computer and then connect the external device to the female USB connector.
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Basically, I play videos off a USB stick plugged into my TV's USB socket, but with the size of videos getting bigger and more stuff being in HD, I thought a self-powered USB Hard Drive would be the answer to running out of space on the USB stick.
Anyway, I bought a WD My Passport Ultra 2TB USB3 drive (faster loading from my PC, even though the TV is only USB2), loaded a trial video and plugged it into the TV.
First problem, my Panasonic TV had one of the USB slots marked HDD, so I plugged the drive into that. The TV didn't even recognise it. Research showed that this is for recording on to from the TV, and only works with certain disks anyway.
So I plugged the drive into one of the other USB slots, the drive powered up, and the TV gave a warning of a USB power overload and told me to turn the set off!
Further research revealed this little gismo that takes power simultaneously from two USB slots while inputting a signal to only one of them.
I ordered one, it arrived next day (well done!), I plugged it into two of my TV's USB slots, connected the WD hard drive, and it just worked.
The TV said "USB Device Detected" and I could then play videos off the hard drive just like off a normal USB stick. But now have space enough for 2TB (that's 2000 Gigabytes near enough) of videos. With each HD TV show taking up about a Gigabyte, that's nearly 2000 shows!
Panasonic should get its act together and move into the 21st century. But until it does, for about a fiver, this device is a life saver.
For many recent computers you could have connected the external hard drive direct to the computer without using this cable - and it will work if the computer can supply enough currebt via a single USB port. If this does not work, the connection seems slow or intermittent then probably the computer cannot supply enough current from one USB port - that is where this cable comes in - now current is drawn from two ports and the external drive should work fine.