External hard drive eject error when computer is asleep

Having some major problems with my iMac. It seems when the iMac goes to sleep I get an error saying the disk hasn't ejected properly. This is not the first hard drive to do so! Several months ago my Buffalo Drive Station would give me that error every night. This was before I was using Mavericks. I decided to upgrade and from that point on my hard drive wasn't recognized at all. I got the disk restored and bought a new Lacie. Everything has been fine for 2 months and now I am getting the same message on my Lacie Drive! I'm afraid whatever is going on is going to ruin the new Lacie.
I've seen some similar problems with other user who have said turning off "Put hard drives to sleep" int the Engery Saver preferences works. But I always had that off. Not sure what to do. Can anyone help?
Running OSX 10.9.2.
Thanks.
E

about once an hour.
That behavior seems somewhat suggestive of the issue described [here|http://www.shirt-pocket.com/blog/index.php/shadedgrey/comments/mackeep_waking_on_its_own_try_this/mac_keep_waking_on_its_own_trythis>.
So I would try going to System Preferences>Energy Saver, and if "Wake for network access" is checked, then uncheck it.

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External hard drive eject error when computer is asleep

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