USB 3.0 requires .9A current per USB port. Isn't this USB 3.0 hub underpowered since it only supplies .5A per port? - maybe you could actually answer
650926
I have had no problems with this hub, it is a transparent little workhorse. I have three drives connected to the first three hubs nearest the on/off switches with no issues. I am not a good person to ask about the amps.
650927
My problem wasn't the power. It worked fine. My problem is that the USB3 Main input broke off inside the unit when I p=tried to attach the USB Cable and now the unit is useless. So I'm screwed. Paid $56 a couple of months ago for a useless unit.'
650928
You know what thats interesting that you bring that up. I hooked a 4 drive enclosure to this hub and evey time I would write to the drives on in the enclosure they would drop off (meaning they would disconnect and then re-connect). when I connect the enclosure to the 3.0 port on my actual machine it worked? I wonder if its becuase of what you brought up with the current not being strong enough? But I dont use this thing. The power connector is flimsy and the ports sometimes would not power up at times. its not well made I would not recommend buying this.
650929
You are asking the wrong guy, I only know when it worked it would run 9 asic USB miners because it has external power source 5 amp
650930
I'm not sure about the amp numbers, but I'm using the hub with 2 USB3 portable drives, 1 USB2 Ethernet, USB keyboard/mouse, and USB/serial port, sometime plus more peripherals at the same time, without any problem.
650931
The USB 3.0 standard is .9A per port. So with a 5V, 5A power adapter, you can only connect five bus-powered USB 3.0 devices (.9A x 5 = 4.5A) before running into problems. You have a little more flexibility with USB 2.0 at .5A (can use all ports except the charging port), but if you're going to do that, you might as well buy a USB 2.0 hub and save some money. Anker has a similar product (9 USB 3.0 + 1 charging port) that comes with a 12V, 5A charger. The power adapter is not a wall-wart...it's a brick similar to what laptops use, and it's bigger than the product itself!!! It adequately powers nine USB 3.0 devices and an iPad because of the whole Volts x Amps = Watts thing and some undervolting to allow the 12V adapter to power 5V devices.
650932
In addition to my earlier answer: You have to use a USB 2.0 port, cause you are right under powered 3.0
650933
Really, he can not for example make you able to connect 10Hds at once. But it is a very cool product for those who have multiple devices as I want and still call each type HDs more. But if you really are looking to have the energy needed to connect more hard drives will not. Perhaps due to this reason you cited.
650934
I haven't used anything power-hungry on 3.0 so I can't comment. Mouse, headset and charging other devices at the same time works just fine though.
296141
It depends on its power usage. It may require the full 500mA coming from your computer's USB port. A hub shares its power limit across its ports. As long as no other devices attached to the hub require port power, it should work fine attached to it. If there is any doubt, don't do it as you are running the risk of data loss and physical damage to the card(s) and/or reader.
189200
I know this is really late in response but I found that the 7 port hub would not work with usb 3 on my computer. I don't know if this is something to do with my computer's usb 3 chip set or if the hub is just bad. My computer is an HP Pavilion dv6. I had purchased 3 of the 7 port versions and all of them had the same result. They worked fine as a USB 2.0 hub but I really need the USB 3.0 version. Since they worked just fine with USB 2.0 I am thinking this is a chipset issue or firmware issue.
423988
Remember, this is a 4 amp unit. That means that any single device which needs less than 4A to charge, will be charged.... as long as that is the only device attached. If you have other devices attached, they will be drawing some current, usually up to 900 mA for a USB3 device... sooo something like an iPad may not be able to draw enough current. Most other devices should be ok.
1479637
Hi there Since I have the 4 port USB3.0 ...I have checked that my external hard drives that are powered up by an extension cord are USB2.0 and it works with my USB3.0 port on the USB HUB. I can not see why not it would not work with the 7 USB 3.0 port. I have this USB 3.0 port hub on Windows 7 Ultimate so it will work with windows 7.
2097573
Don't quite know what you are asking. We have a 7-port usb hub and though we use it for only 3 devices + 1 once in awhile, it works like a charm. Since there are 7 slots, it will take 7 devices.
2095582
The standard is 500mA for USB 2.0 and 900mA for USB 3.0. Do the math, and you'll see that the power supply doesn't cut it for 24 USB 2.0 and 4 USB 3.0 ports. 24 x 500mA = 12A 4 x 900mA = 3.6A The power supply would need to be 15.6A at 5V. Since the power supply is only 4A at 5V, you're only going to be able to power four USB 3.0 devices (900mA x 4 = 3.6A) OR eight USB 2.0 devices (500mA x 8 = 4A). Perhaps Manhattan should do what Anker does and use a 12V adapter and whatever they do to undervolt/cut down their USB 3.0 9-port hub to 5V per port (that thing comes with a 12V, 5A power adapter! The brick is almost as big as most laptop power bricks!) Using the formula of Volts x Amps = Watts (5V x 15.6A = 78W), we can conclude that at 12V, only 6.5A would be needed (12V x 6.5A = 78W). It's a shame, though, as a 28-port USB hub is cool as all hell, but in practice, it doesn't work right unless you're using all self-powered devices (devices that have their own power adapters).
1472028
The hub has separate connectors for USB 2.0 and 3.0 that go to your motherboard USB headers, so the performance will be dependent on your mobo chipset, not the hub. Modern chipsets have a dual-bus design to allow the two specs to operate simultaneously at full speeds. Remember though that not all USB drives are created equal and chipset performance can vary between mobos.
95052
Yes. The manual clearly states that external power is required at all times. USB 3.0 ports are supposed to provide up to 900 mA, each, so requiring an external power source for hubs is pretty much written in stone. Also, it is worth noting that older computer systems probably do not have USB 3.0 ports built into them. My own laptop is a 2011 ThinkPad, and I had to buy an adapter card to get the support.
44833
The listing is Various. UNITEK USB 3.0 Hub 4 Ports with 5V 4A Power Adapter Power Switch USB 3.0 cable should have a power adapter. That man may buy another one bus-powered hub which don't have a power adapter.
1293899
I belive the mini USB 5 pin is the same but i'm not sure about the power requirements. Sorry
2022009
It has no 'amps' per se. This is a passive,not powered, hub so it will be able to source no more total current that the USB port that it is connected to.
214037
Dear Annabelle, Unfortunately, our Premium 4 Port USB Hub is not powered, and will not power an external Superdrive (which is the case with most USB hubs) as they require over 500mA. The total amount of power going to the hub may not exceed 500mA. If you have any other questions or concerns please let us know. Thank you,Satechi Technical Support
1011959
5 amps. But the power supply is 12 volts, so in reality the USB-devices you connect can pull way more than that since the USB ports are only 5 volts. Remember that volts multiplied with amps equals wattage (so 12 volts times 5 amps equals 60 watts). Nine USB ports providing a maximum of 0.9 amps times 5 volts equals 40 watts, and then you have a charger port of 2.1 amps times 5 volts which equals 11 watt. So in theory, if you fill up the entire device with USB-devices that can draw maximum power from all the ports, the maximal power draw should be around 51 watt, which is less than the power supply provides. Therefore, this hub should never give you any disconnects because of too huge a power draw, which was a frequent problem with my old USB hub.
377432
The hub has a 12 volt, 2 amp power supply. I assume the amp capacity is divided among the 4 ports. You'd need to find out what the current draw is of the external drive to be sure.
189285
Mine came with a power brick, for what it's worth. I believe that this hub corrupted my external usb 3.0 hdd, and pretty much killed it. Don't know this for a fact but I don't use it anymore.
257112
The USB-2 hub itself provides 0.5 amps at 5V. The external power supply (included) provides 2.0 amps at 5V. So, the 2.5 amps total, is divided into 7 ports or total of 2.5 amps for power draw (like 1 amp for Port-1 plug-in and 1.5 amps for a Port-2 plug in). Usually USB devices draw less than 0.5 amps (except external HDD or external DVD+RW).