It helps us answer questions if you spend some time explaining what you actually want to do in some detail. One sentence is almost never sufficient. There are at least three different ways to interpret this question.
Right clicking on a web page gives the option Create Web Page Item from Current Page.
That is what I would call Save.
Then I want to control where the item is saved.
That is what I would call Save.
Then I want to control where the item is saved.
But since you also mention the HD, I wonder where Z is on the HD aswell
re HD: http://www.zotero.org/support/zotero_data