Re: What's the difference between...
I've seen too many Segregate drives vibrate and although they still work, it can be extremely annoying.
I have spoke with Seagate support and their first reply was to tell me to mount the drive with screws . Well all my cases are tool less, and most newer cases are tool less. After several RMA's I still have a couple vibrating Seagate drives that I was able to mount into external enclosures but I had to replace those drives with something that you could live with. Seagate's off my list for drives permanently.
Edit: note to PP......I have not seen this issue with any older Seagate drives. Just the newer drives since around 2013, They have had to change something in manufacturing