Delay in Doing something when Time Machine's External Disk Attached

I wasn't sure where to post this question. I have Time Machine running and it copies to an external LaCie hard disk.
I notice that when the disk is powered down (between Time Machine backups), when I do things like launch a program or even right mouse click on a word to look it up in the OS's dictionary, the computer pauses to wait for the LaCie disk to turn on, spin up, and then it loads the dictionary and word.
Why? What is telling the computer that this needs to be done? How to tell the computer not to do this? I can't think why this would be needed since nothing should be running off the TimeMachine backups.

I wasn't sure where to post this question. I have Time Machine running and it copies to an external LaCie hard disk.
I notice that when the disk is powered down (between Time Machine backups), when I do things like launch a program or even right mouse click on a word to look it up in the OS's dictionary, the computer pauses to wait for the LaCie disk to turn on, spin up, and then it loads the dictionary and word.
Why? What is telling the computer that this needs to be done? How to tell the computer not to do this? I can't think why this would be needed since nothing should be running off the TimeMachine backups.

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