Is it ok to replace 2 X 1T with 2 x 2T wd green drives in My Book Word nas

have any one repalced 1T drives to 2T green drive in My Book World NAS.  I need to upgrade for my home. Other options I am thing is buying two WD 3T Could nas one for backup and one for service.

I did it with 3TB drives and it worked perfect, so 2TB drives should be also okay.

Look at this thread: