- #How many devices can usb bt400 support serial number#
- #How many devices can usb bt400 support plus#
Those kinds of tasks are processor/RAM/power hungry. Since you are wanting to transfer videos/graphics/images, I would not consider using any peripheral that is not self powered (with an adapter) and/or, at the very least, use the computer plugged in to power. What MBP though? Is it one of the new ones with only USB-C ports? If you need a USB-C hub with USB-A ports, then I imagine it should be more than adequate since they typically draw a lot of current. It says it needs 5 V, 2 A, which is well past the USB 3 specs for even two ports. It probably requests less power than a separate enclosure/drive combination, which will typically reserve as much power as it can get just in case the drive needs it.Īs an example, I believe that I would be able to operate three of my 1 TB Seagate BUP Slim drives with a proper USB 3.0 hub. I know we've been arguing back and forth on another topic about external drives and enclosures, but for your purpose that Seagate drive might be ideal. Vendor ID: 0x1a40 (TERMINUS TECHNOLOGY INC.) If you have a hub you can see what it requires. I'm not sure about the 4 TB version, but you can see what it says.
#How many devices can usb bt400 support serial number#
You'll see a whole lot of stuff, but this is what I see (minus the serial number which I've blanked out): You should see the drive under "USB 3.0 Bus". Click on Hardware>USB to get the USB Device Tree.
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Then click on the button on the bottom that says "System Report". Click on the little apple in the upper left corner and select "About this Mac". Of course eject the disk when you move to the next one. I'd recommend plugging them in (one at a time) without a hub to find their current requirement.
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You can find out what the current demand is using System Report. I've never had one fail to work with a single plug going directly to the computer's port. I'm not sure they really need two if plugged into a compliant USB 3.0 port. The double-plug setups were actually needed back in the USB 2.0 days when USB 2.0 ports were only rated as putting out 500 mA, and when hard drives tended to use more power than they do today. I'm just trying to cover all of bases for situations in which there is no AC option.
#How many devices can usb bt400 support plus#
Just bought a 13in MBP (only two ports) I was hoping to use them to power 2 Seagate 4TB Backup Plus externals and a RED mini mag station which (like the older drives that you mentioned) has the option to be powered from a second USB 3 connection. I work in video and I have a project coming up that's going to require dumping cards to recycle and keep shooting. But if plugged directly into my USB 3 port it says that 900 mA are available and that it requires 898 mA. I can't get it to work on the hub at all. I also have another drive in a Patriot Gauntlet 2 enclosure. I'm pretty sure they play certain tricks with the power supply, because bare drive specs say that they need more than 144 mA during startup and writing. I think a second one might even work as long as there's enough available current for all the devices. I don't quite understand what's going on, but it's working. When I plug it into my unpowered USB 2.0 hub, it's reporting 100 mA available and 100 mA needed. When plugged directly into a USB 3 port, it's reporting 900 mA available current but 144 mA required. Just as an example, I've got a Seagate Backup Slim external drive. Most modern drives require much less power. They recommended using a second one simply to draw more power.
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Back in the day, a lot of external bus-powered drives came with cables with two USB-A plugs.
![how many devices can usb bt400 support how many devices can usb bt400 support](https://i5.walmartimages.com/asr/f15d5d23-4010-46a7-aa32-e829d44e1376.fd0a2217e858f87c5efbf58da3c5b396.jpeg)
Again - it really depends on what drives. Sorry - gave you an overly technical answer. If you directly plug in an iPhone or iPad it can actually provide an above-spec 2100 mA. Obvious battery powered devices can back off of using current. It's actually reporting the iPad mini needs 500 mA but nothing else has changed. I just plugged an iPad mini into the hub and checked again. If it's not then there will be some sort of warning message. So the 500 mA that the port provides is enough. On my hub I currently I have a SanDisk Cruzer Micro that reports a current requirement of 200 mA, and a Logitech Nano receiver with a current requirement of 98 mA. I don't have a USB 3 hub, but I do have an unpowered 4-port USB 2.0 hub. Powering peripherals through USB - Apple Support If unpowered, the hub itself needs to reserve some power for its own operation such as lights and communications. If it's an unpowered USB 2.0 hub then it would be 500 mA. What computer, what hub, and what devices? If it's a USB 3 port it should theoretically be able to provide 900 mA to an unpowered USB 3 hub, and then the power distribution would be negotiated.