External hard drive disappears when imac wakes up after sleep

Hi Everyone.
Got a really silly question but I can't seem to figure out where to fix this
I have 4 USB 500gig hard drives all run off a 13 port powered hub.
Now I have one hard drive set aside for my films which I and ripping so they can be view via my apple tv 2nd gen. The other is for MP3's and the other 2 get are redundunt at the moment.
No the problem is when I rip a DVD, I rip it to the hard drive on the iMac and then trans the files to the external drive. As I rip them at a high quality (2 to 3 gigs per film) I get the transfer box saying it will take X amount of time. The only thing is the iMac after some minutes will go to sleep.
When you wake it up the hard drives have disappeared and the is an error saying the drive have been ejected incorrectly.
I'm assuming the iMc is putting the drives to sleep when it goes to sleep.
Is there a way to keep the hard drives running but only put the momitor to sleep. The problem is also happening when I use USB memory sticks (I have a 4/8/16 & 32gig sticks all with various bits of info that I am sorting out from the move from Windows PC to Mac.
Can anyone point me in the right direction to get this fix coz I can't seem to find the setting
Thanks
Rick

When you are doing this, set the drive to never sleep, slider completely to the right and display sleep to something like five minutes. Or just hit Control-Shift-Eject, to sleep the display. Uncheck "put the hard disks to sleep..." That said, the firmware on the externals may be spinning them down. But this shouldn't be happening if they are being written to.
System Preferences> Energy Saver.

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