Integrated 4Port-USB2 Hub: AC-powered or Bus-powered; enough juice to support portable hard drives, or charge mobile device? ASUS Support don't know.
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Bus-powered. I tried charging my phone without the cable plugged in and nothing happened.
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In general, I have found that the USB hubs that supply a wall-wart for power to the hub, do indeed NEED the power to the hub.Dick
1899940
Does the USB 2.0 port provide enough power for the external HDD? Or should I make sure to use an external HDD that has its own power source?
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It only has 2 usb2 ports this is not a problem however because you can always plug in a usb hub. I also has 2 SD card slots, this feature comes in very handy. Not many devices have a feature like that. Not many people realize it but this is one of the best choices for a mod box. It is inexpensive and has dedicated spots on the MOBO for 3G mobile card /sim card /digital TV / and GPS. Really!
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MANUFACTURER ANSWER: Thanks for posting your question here, John! No, http://www.amazon.com/dp/B005HKIDF2/ is a bus powered hub and cannot be used for device charging. If you need any additional information, please do shoot us an email at support@plugable.com. We are here to help! Thanks! Regards, Roze Plugable Technologies
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The USB 2 and media card reader ports are part of a powered hub and need a 4 pin molex to work, as far as I know. The USB 3 and eSATA ports will work without an independent power connection.
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This device is powered by the USB port and require more power than a notebook USB can supply, so a powered USB hub is needed to obtain the best performance with a notebook.
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It is not listed on the device. wikipedia says "Powered USB is a proprietary extension that adds four additional pins supplying up to 6 A at either 5 V, 12 V, or 24 V." I have a 5V 2 Amp adapter whose connector is too small.Output of the cable reads 5 V. I had to check because I had not heard of 12 V or 24 V in conjunction to USB.
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Yes you do. This is the one. Generic Premium External Power Supply 5v 1A 2A (1000mA - 2000mA) AC/DC Adapter, Plug Tip: 1.35mm x 3.5mm x 7mm, for USB HUB and 2.5-inch HDD Enclosure
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Premium External Power Supply 5v 1A 2A (1000mA - 2000mA) AC/DC Adapter, Plug Tip: 1.35mm x 3.5mm x 7mm, for USB HUB and 2.5-inch HDD Enclosure
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Note that Airs through the 2011 model came with 2 - USB 2.0 ports; starting with the 2012 model they now ship with 2 - USB 3.0 ports. USB USB 2.0 powered HDs are designed to work within standard USB 2.0 specs, i.e. max 0.5 A @ 5V. If you are getting 2 external drives to work through one hub that is pretty good already, as together they are probably drawing greater than the USB 2.0 spec. The Air's USB ports are purposely over-designed to power an external Superdrive, which pulls 6-7 W (a bit over 1 A @ 5V, which is actually greater than the USB 3 spec of 0.9 A @ 5V). That's what makes an Air great at charging Iphones, which similarly pull about 1A. I would recommend running "overpowered" devices like the Superdrive or iPhone directly from the Air's USB port, and not through a USB 2.0 hub. If you need to run a bunch of lower power USB devices, too, it would be fine to run those through a hub on the Air's other USB port. Mainly my $0.02, but I am a very happy owner of a 2011 Air which has worked very hard over the last 14 months, and shows no signs at slowing down.
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i do not recommend buying a USB powered Hub for external drives. Buy the one with external power. The USB powered one will turn off your HD sometimes and it is annoying esp if you are downloading files.
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You have to have AC to power it. The smaller, "min" versions of the g-tech drives are able to be bus powered. Strangely, on the amazon pages per the technical details, in the "Special Features" section, it says "usb powered". However, upon looking at the g-tech web site and other resources, this likely just refers to it having usb ports...more of a marketing term than a technical term. I reviewed the technical manual, product guide and datasheet on the site for the product with no mention of being able to use the USB to power it. I will try with mine at home but I have had mine for a little over 6 months and had it AC powered the whole time. I would not expect a workhorse like that to be able to be bus powered.
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That other answer is not entirely correct. A powered hub can operate on USB power only. It does not NEED to be plugged into AC. It will work the same as an un-powered hub, which will limit you to a total of 500mA of current draw from all ports combined. However, if you use the AC adapter then you will have up to 500mA per-port (2A total).So if you are only going to connect low powered devices, or self powered devices, then the AC adapter can be considered optional. If you need to connect devices that draw more power (portable hard drives, USB powered scanners, burners, etc.) then you would need to use the AC adapter to supply the additional power. That other answer is not entirely correct. A powered hub can operate on USB power only. It does not NEED to be plugged into AC. It will work the same as an un-powered hub, which will limit you to a total of 500mA of current draw from all ports combined. However, if you use the AC adapter then you will have up to 500mA per-port (2A total).So if you are only going to connect low powered devices, or self powered devices, then the AC adapter can be considered optional. If you need to connect devices that draw more power (portable hard drives, USB powered scanners, burners, etc.)... » Read More That other answer is not entirely correct. A powered hub can operate on USB power only. It does not NEED to be plugged into AC. It will work the same as an un-powered hub, which will limit you to a total of 500mA of current draw from all ports combined. However, if you use the AC adapter then you will have up to 500mA per-port (2A total).So if you are only going to connect low powered devices, or self powered devices, then the AC adapter can be considered optional. If you need to connect devices that draw more power (portable hard drives, USB powered scanners, burners, etc.) then you would need to use the AC adapter to supply the additional power. « Show Less
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No. This is totally portable. No external power needed. It will not charge devices it is just a hub which is exactly what I wanted. It works terrific.
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USB ports can only supply limited DC power. Sometimes a two or three port passive (no power supply) USB hub can be useful, but don't expect a seven port hub to operate without a separate power supply. If you're inventive, you can construct a battery power supply with parts from Radio Shack so that you can occasionally operate away from utility power.
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MANUFACTURER RESPONSE: Thanks for asking! 2.5A is the total power available from the power supply- NOT the amount of power available to ANY ports. To say that another way, you would have 625mA (.625A) power per port max when using all 4 ports. The max current draw for a device complying with the BC 1.1 specification from any given port is 1500mA (1.5A). Please note this full current draw would be available to only one device at a time. When charging 2 devices simultaneously, we would expect charging at a max rate of around ~1250mA (~1.25A)- assuming no current is required by devices in the other two ports. Sorry we can't offer a more clear explanation here- USB charging is really a complex topic where devices from different manufacturers have very different behaviors. To top that off, many devices actually negotiate with the host PC to determine what rate to charge at, so behaviors on these will vary depending on whether a host PC is on and awake versus when there is no host PC or when the PC is sleeping. A more detailed explanation of the history on how the industry got into this confusing state is here: http://www.maximintegrated.com/app-notes/index.mvp/id/4803 Hope this helps! Please let us know of any other questions by emailing support@plugable.com or visiting support.plugable.com Best wishes- Jeff Everett Plugable Technologies