How to mount external drives

Being new to iMac and connecting four external drives I need to know how to mount and dismount them

noondaywitch
Thanks for your help and I've followed your reply and yes I can see how to mount and eject drives.
Probably it would have helped if I had told you that my drives are all USB.
All connected to a small four way hub which is then connected to one USB socket in back of computer.
One - I use as a music drive and is a 160 gb iomega
Two - is a partitioned drive for Photoshop use 340 gb WD
Three - is a drive which has all my ex-Windows computer files and is one TB WD
Four - is a Video and Film drive of one TB WD
Five - is my dedicated auto backup drive which is of one TB WD and is connected directly to a USB socket of computer.
I normally set my computer to sleep until the next time I'm using it, then when I do go to use it, I get the warning message regarding drive was not ejected. Didn't have problems like this on PC so I became worried that in time I'm going to loose files and or the complete drive. Which one is giving me this message is also a bit of trial and error problem. Like suck it and see.....lol.
Anything else you can help me with this query would be most helpful and appreciated. Like do I have to eject all drives before leaving computer and then mount all the drives again for next session.
Regards
John

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