If I do that, it works.2 answers 4 votes: I am pretty sure this is an issue with macOS Sierra. The Mac puts up a notification USB Accessory Needs Power / Connect Apple USB Ethernet Adapter to a USB port on this Mac. Even with all those features, it's reasonably. It can be used with the included power adapter, but can also be powered by the USB hub when needed for portability. It is USB 3.0, backwards compatible to USB 2.0 (which is important), and even has a USB 1.2 port. If I was in the market for a new one, I'd get the Anker Unibody USB 3.0 7-Port Hub.
![]() ![]() Usb Hub Needs Power Mac Puts UpIn the middle-of-the-road scenario you’ll end up with a poorly wired, insulated, and protected device that could possibly lead to one or more of your expensive attached devices getting fried thanks to poor design and construction. In the best-case scenario, you’ll end up with a device that’s a knock-off in name but possibly built to similar specs (and maybe even at the same factory) as the brand name. You can buy both desktop and laptop USB adapters for very cheap it’s easy to eBay a powered adapter for around $10 or less.We’d strongly caution you against doing so. Even small but high-quality laptop USB adapters run around $15 or so. The HooToo will run you around $40 and the LOFTEK will run you around $45. Spend Cash Acquire SafetyBefore we delve into the features that are obvious (case design, number of ports, etc.) let’s talk about the most important feature that isn’t readily apparent to end user: internal construction and safety measures.The two USB hubs we’re showcasing in this guide aren’t the most expensive on the market but they aren’t Big Mac meal cheap, either. Recent studies of dmg efficacyFlakey hubs are frustrating, but you can easily avoid data drops and safety hazards by picking a high quality and highly rated hub. We tested both the HooToo and the LOFTEK with all the USB devices we could throw at them doing all sort of bus/power taxing things like multiple USB hard drive read/writes concurrently, ejecting and remounting other devices during those processes, pulling mobile data through a USB dongle, and so forth all without a single hitch. If a sub-spec power transformer blows out and starts the back of your desk on fire while you’re at work that extra $20 you could have spent on a higher quality device will be a drop in the bucket compared to dealing with even a small house fire.Lightning strike probability of a bad USB port killing you aside, you’re typically purchasing better build quality when you spend a little extra. While the capability of a USB 2.0 hub might be just fine for your present needs the price difference between a quality USB 2.0 and USB 3.0 hub is negligible and there’s very little reason to buy a USB hub based on 2000-era speeds and technology when you can get a USB 3.0 hub for a little more. Other features include battery charging specifications (introduced in USB 2.0 and upgraded in 3.0), better data handling for concurrent connections, and such.Although it’s quite rare to find a USB 1.0 hub anywhere these days (unless you discover it on the dusty shelves of a small town electronics store), there are still plenty of USB 2.0 hubs floating around. Each iteration has introduced new features, the most notable of which is increased transfer speeds. Although not as common, some USB hubs are dynamic-powered and feature a circuit which can detect whether or not the hub is currently bus-powered or has been hooked up to a transformer to become self-powered and will adjust itself accordingly.If you’re using a little USB travel hub, like the Sabrent 4-Port USB 3.0 Hub, you’re limited to the maximum amount of power the USB port the hub is attached to can provide. USB hubs come in two flavors, in regard to power, bus-powered (wherein the hub draws power from the host computer via the USB bus/port it is connected to) and self-powered (wherein the USB tether to the computer is exclusively for data and the actual power for the hub and attached devices is pulled from a separate power pack). Unless Ultra-Portability Is Critical, Buy PoweredAside from data-speed bottlenecks introduced by using old USB hubs on modern USB 3.0 ports, the biggest shortcoming you can introduce to your USB hub setup is a lack of power. Don’t buy old technology when a few extra bucks will give you better speeds and more features. After all, that old laptop could kick the bucket any day leaving you with a hub to repurpose for a new project (or to move onto your new, definitely has USB 3.0 ports computer).If you’re reading this guide years down the road and the new standard is USB 4.0, the same rule applies. Even when buying a hub for an old computer that doesn’t even support USB 3.0, you should strongly consider getting the newer standard. If you need four extra USB ports on your machine today, it’s silly to buy a 4-port USB hub. The More Ports the MerrierAgain, unless ultra portability is critical, bigger is better. Especially for projects like adding peripherals to the Raspberry Pi microcomputer, a powered USB hub is mission critical as the host device just can’t crank out enough juice for a bevy of attached devices.Both of the HootToo and LOFTEK feature separate power supplies that offer a nice stable source of power for all ports. Each port on the USB hub will receive full USB-standard power with no dips in power or devices disconnecting for want of a stable connection. The LOFTIS features a side-out arrangement more common in smaller travel hubs. The HooToo features a vertical-orientation design reminiscent of an electrical power strip. The two units featured here have two totally different approaches to port arrangement. Doing so is certainly more economical and convenient than buying a bigger hub next year or adding a USB expansion card to your computer.In addition, pay attention to how the ports are oriented on the hub. Especially if you’re purchasing the hub for a desktop computer where portability isn’t even a factor (and you can easily tuck the USB hub out of sight regardless of how big it might be), it simply makes sense to pay a few extra bucks for a few more ports.
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