migratory assistant wants to put all my files from PC on to SSD

i'm sure easy fix, got first imac today on learning curve.
need set 2tb harddrive receive data , not ssd drive wants do.

appreciated wonder why computer set way ?

 

would easy fix
can,t use migratory assistant ssd not big enough data, have caddy , think ssd upgrade may have been waste of time hassle !

 

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