Sentinel-1 processus not completed

Dear all,
i work with sentinel 1 toolbox , when i want to export imagery data in tiff
there is a problem with reading the image (I get a tiff image with a part missing ). i have 8 G in RAM laptop ,is it enough ?
Best regards

I think you may need to be more specific. What data are you using, what processing was done, how was it exported?