USB Harddrive NAS wont wake up after spindown

I followed this guide to make my nas hdd spindown after not being used for a while. However once it goes into standby I can't seem to get it to wakeup without having to go and unplug it from the router. Because of it going into standby, none of my computers can access the drive anymore in the samba share I have setup for it

This is particuarally annoying because I don't want to go have and constantly have to unplug it just to get back on but I also don't want it running all the time since the drive is a hard drive. Anyone have any idea on how to fix this?