In fact, I've noticed that they even sometimes have problems using power from a single port + an external AC->USB adapter, if I use a cheap power adapter presumably because of the crappy quality of the power provided.
However, the ones where I harvested 2.5" drives and then stuck them in 3rd party enclosures are the ones that sometimes have issues being powered by only a single USB port. It seems all of my USB 2 2.5" external drives that I bought as one-piece units work fine over regular USB power. By NEC-Renesas are you talking about two different chips?Īs for using a USB 2.0 device in a USB 3.0 port and power, it may be a moot point if I stick with branded external drives, instead of buying an enclosure and putting my own drive in it. I didn't look at the card's chip before I installed it but Google seems to indicate it's a NEC chip. There was a Startech one as well, but it cost almost twice as much. I ended up buying the D-Link DUB-1310, mainly because it was a recognizable brand name and because it was the only decently priced one (CAD$35) available locally that came with a low profile bracket in the box. The power supply seems tiny but I figure I can just buy a Y-splitter for say the optical drive SATA power, and attach a molex adapter at the end, right? It takes low profile PCIe cards.Īny recommended brands? My local stores sell Mediasonic, Vantec, D-Link, Syba, Silverstone, SIIG, Star Tech, Bytecc, Zalman, Western Digital, etc.ġ) Low profile USB 3.0 adapters with low profile brackets seem pretty uncommon.Ģ) This machine has all of two power plugs, both SATA, and both used. It'd be nice if I knew they'd work on a single port if the ports were USB 3.Īlso, I want to add USB 3.0 to my Acer Aspire X3400, which is a slim machine.
I'm just wondering because I have several mobile USB 2 drives that don't work consistently with a single USB port. If I attach a USB 2 drive to a USB 3 port, will I get up to 4.5 Watts? Or am I still limited to 2.5 Watts?
USB 3 provides up to 0.9 Amps x 5 Volts = 4.5 Watts. USB 2 provides up to 0.5 Amps x 5 Volts = 2.5 Watts.
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