someone told me it wouldn't be that fast because it was a whole Terabyte.
Is that true?
I don''t believe so. An SSD is basically a giant RAM stick - shouldn't matter how large it is. I haven't heard of any memory management issues that require a location above xxxGB to require additional processing.
Okay, well my friend is sticking to the story so I guess we will find out, thanks!
Sticking to his story based on what? Facts or opinions? Ask him to back up why he think this way and ask for sources. I've never heard of ssd's being slower the bigger they are either.