No, data is copied into modified table.

>Thanks, but if I have data, doesn't this (when un-checked) dump the data when the table is re-created?
>
>>Greg,
>>
>>You may just need to go to Tools | options | expand "Designers" and click on "Table and Database Designers" and then on the right un-check "Prevent Saving changes that require table re-creation"
>>Tim
>>