Hi, I have two USB 2.0 drives that require 200 and 300 mA respectively, and an external 2.5" external hard drive requiring 144 mA, all according to the System information. From what I gather, my SDHC-card class 4 use maximum 100 mA when reading/writing. I am experienced enough to know issues might arise with peripherals acting up, disconnecting, and not being recognised by the computer when connecting too many into the same port using an unpowered USB hub, but that's about all I know... My complete rookie logic is the the hub requires 100 mA, and adding the 744 mA for the peripherals mentioned above it is still short of the 900 mA that the USB 3.0 port can provide. But I have no idea whether the power requirements are as linear as in my thinking, or even how to interpret the current requirements being reported, and I just can't seem to find the answer to my questions via Google. So my question is this: would an unpowered USB 3.0 hub with three ports plus an integrated SD card reader be able to handle this with no issue even if I for some reason would move files to/from all four peripherals at once? Or is it necessary to purchase a powered hub in order to not run into problems? In case anyone wonders, or if it might be relevant, these are the two hubs I am choosing between: - unpowered: https://www.amazon.com/gp/product/B01LWYCA1U/ref=ox_sc_sfl_title_1?ie=UTF8&psc=1&smid=A2071U4930RVPV - powered: https://www.amazon.com/Xcellon-4-Po...8&qid=1496172252&sr=8-8&keywords=xcellon&th=1 (But branded Orico in my local Amazon-store.) Thank you for reading.