[SOLVED] How to figure out which HDD is inside an external drive ?

I am using this drive, it can come with a Barracuda, Barracuda Pro or Iron wolf pro...How do I figure out which HDD is inside without shucking the drive ?
 
I am using this drive, it can come with a Barracuda, Barracuda Pro or Iron wolf pro...How do I figure out which HDD is inside without shucking the drive ?
 

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