Thanks to all for replying. The model is a Chinese-made Sigma USB Hub bought in Japan, where I live (http://www.amazon.co.jp/シグマAPO-USB2-0対応USB4ポートHUB-HBHA4シリーズ-ミラーグレー-HBHA4MGR/dp/B00074Z8K6); it is very simple, no drivers. It does not have an independent power supply, BTW. I don't think it is...
I am running Windows 7, and I connect several external HDDs via a USB hub, leading to the PC on a single USB cable. I have recently installed Windows, and from the start, I have had problems ejecting the media. Here is how it goes: I plug in the disks, they are all functioning, they show up and...