Upgraded to 10.10.3, the external hard disk keep working and spinning after I ejected successfully, and the HHD keep lights up, feel unsafe to unplug it

I tried on two macbook air, same situation.
This never happen on 10.10.2 or previous version. (The HDD light will off and it will stop running after I ejected before.)
I feel unsafe to unplug the external hard disk when its still light up and running.
I am using Macbook book air 2012 and 2013 with seagate backup plus....
Anyone have same problem? how to fix it?
or its ok to unplug the HDD while the HDD light is still on and running?
MacBook Air, OS X Yosemite (10.10.3)

I have a G-Tech external hard drive that continues to spin after I have unmounted it and if I disconnect it while it is spinning it makes a very nasty sounding clunk noise. In my case it started doing this after I enabled FileVault a couple of years ago. I have found that if I unmount it and then wait 6 minutes it will stop spinning. It is inconvenient but I only use it once a week and the clunk sound is scary enough that I put up with the wait.

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