Using my old iMac hard drive as an external to my macbook pro

hi
I was wondering whether it's ok to use my imac's drive as an external hd for my new macbook.
You see, my imac had some trouble with the power supply and i decided not to fix it. Instead, I took out the drive and put it in a case so to use as an external for my new machine. The thing is, that drive is the operating drive of my imac, so it has everything on. (Appz, Library, Utilities, Operating system- i suppose).
I only need documents such as pictures/videos/mp3s etc on that drive. All the rest I have with my new drive.
What's the best thing to do?
Keep using it as it is?
Transfer the documents i want to save and format the drive?
Something else?
Thanks for your time.

Transfer the documents i want to save and format the drive?
Yes

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