I have a USB hub on Windows with several portable hard-drives attached to it. I started feeling very slowed down when taking backups while trying to do somethi

I have a USB hub on Windows with several portable hard-drives attached to it. I started feeling very slowed down when taking backups while trying to do something else at the same time. I am using Acronis for backups. Then I tried removing one of those portable drives and everything is much better now. Somehow a single "bad" USB drive seems to be able to slow down the whole Windows-machine.