Force external drive to remain in stand by after Wake up

I have a WD My Book external drive connected to my iMac 27" via USB 3.0
The drive is initially in a stand by mode (drive doesn't spin, it's visible in disk utility).
Now when backup script starts, it first checks to see if drive is mounted. If it's not it then mounts it (drive begins to spin), then the backup process starts, and lastly the disk is ejected (drive stops spining, it's again in standby)
All this works, however my problem is when my mac wakes from sleep, drive automatically starts to spin and is mounted. I want the drive to always remain in stand by except from when it is manually mounted.
How can I achieve such a thing? I have tried the folowing:
Disabling the USB Mass storage: requires restart and results in all USB ports being disabled, which is unaccepted
Setting the drive to "Power up in Stand By feature" with linux command "hdparm": Even tho hdparm says the disk supports this feauture, I've got I/O error
Setting the jumper to proper position to enable PUIS: the white lid is switched on, but nothing happens (not visible in disk utility)
Adding the line in /etc/fstab to prevent auto mounting, which partially works. (drive still spins after wake up)

Thanks for your reply.
There is only the spinning wheel in the finder sidebar when it is actually backing up.
Not after it has finished according to the progress bar in TM Preferences. When that has finished, the Hard Drive just carries on gurguling and ticking.
Until I drag the volume icon to the trash then it stops. AND I have just noticed the wheel starts spinning in the finder window after I have done this and it starts backing up again. It does not eject but I get a notice saying " Is in use could not be ejected. Try quitting applications and try again." (well I do have applications open). Then after this back up all is quiet. But the cycle starts off again after the next sheduled backup starts.
I can not see anything called backupd in activity monitor while the noise is current.
The only activity seems to be from "Activity Monitor" "Finder" "System Preferences" "SystemUIServer"
In 'Console' under All Messages it says Backup Completed succesfully. followed by
kernel............SetCryptoKey R: len 32, idx 1
Sorry I can't make things any clearer.

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