I have a raspberry pi 1 model b+. I try to use my hard drives with it however, usually after several minutes of writing/reading the hard drives suddenly stop working. And they won't work until I reboot the pi.(I am unable to unmount and remount them)
One of the drives is a USB2.0 hard drive with a USB Y cable. The other one is a USB3.0 hard drive. I have tried using just one of them at a time as well. I use a usb hub with an external power supply for the drives. It says it supports a 5V 2A output.
Thank you for your support.