AReyna8, Guardian edge has reached end-of-life and is no longer supported. the recommendation is for all customers who are utilizing this product to upgrade to the latest encryption product, that is SEE 11.
From an IT point of view, you may be able to utilize this product for many years ahead without issue, however, keep in mind as new hardware becomes available you may notice further incompatibility issues, of which cannot behave addressed as the product has reached end-of-life. The suggestion is to use latest encryption product to receive complete product support. regarding your question with 4 k sector, you may want to try 512 e, and re test