Problem in acquiring data with SiGE GNSS Sampler

I have SiGE GNSS Sampler but the problem is that when i want acquire data message " buffer over run" is displayed

and i get only 156 kb data which is not sufficient for position calculation. I want 600 MB of data.

any one can help?

Thanks!

possibly not helping here much, but do try to use a faster USB2.0 complient USB port. That may or may not help you

Thanks for your response.