> I would like to know if a person is diagnosed with DID, does that automactically mean that that person has supressed memories that he/she can't remember?

well... that depends really.

1) every person in the world has experiences that they don't remember.
2) 'supression' or 'repression' is a technical term that has hefty theoretical committments... it is unclear whether there is such a mechanism...
3) the 'post traumatic model' of DID states that DID is a trauma disorder *by definition*. there are other theories of DID, however...

another point...

sometimes people think of memory as being like having a tablet in your head and your experiences make inscriptions on the tablet... and sometimes people can't access the tablet and sometimes they can and therapy (and 'recovering memories') is about finding the tablet.

but memory doesn't work that way...

ever recall is a new encoding...

i don't think it is helpful to think of DID as a trauma disorder *by definition*