Thunderbolt drive not going to sleep when iMac does

Not sure if my title makes sense...
Ok, I have an Intel iMac running the latest version of the O/S
Attached via firewall I have a Lacie external 2big drive
Attached via thunderbolt I have a lacie 2big thunderbolt drive
When the iMac goes to sleep by itself, i.e. I walk away and let the system decide when to sleep, only the firewall connected drive shuts down.
The thunderbolt drive remains live with that nice big blue lamp on the front of the drive remaining lit.
If I manually put the imac to sleep, then both drives shut down. I'd really like both drives to shutdown properly when the system decides I've gone to bed....or gone out or whatever.
Any suggestions?

I have exactly the same problem with three lacie_2big drives.  Thay do not go to sleep when my iMac is sleeping.  I never had this problem untell using OS X Mavericks.  Please help!

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