I have a WD EX2 Can i use the folloing HDD Seagate Barrac 3.5 2TB 7200rpm 64mb 6gb/s

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX2
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Can i use the folloing HDD Seagate Barrac 3.5 2TB 7200rpm 64mb 6gb/s

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This subforum is for single drive WD My Cloud devices. Since you indicated your using a WD EX2, your question is probably better addressed in the WD My Cloud EX2 support subforum:
https://community.wd.com/c/network-attached-storage/wd-my-cloud-ex2

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“No, these drives are unpleasent for the My Cloud device” :sunglasses: