I noticed that in Assembly segments are used in opcodes.

Example:

MOV DWORD PTR SS:[EBP-30],30

I think that "PTR SS:" is used to specify that EBP-30 comes from the stack? (SS: stack segment) Am I right or am I completely wrong? :) And, could you please tell me the difference between the example above and

MOV DWORD PTR[EBP-30],30

And what about DS (data segment) used in opcodes?

assembly x86 masm addressing-mode memory-segmentation
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