4K patching, also known as 4K sector patching, is a technique used to enhance the compatibility and performance of certain software applications, including SSIS, with modern storage systems that utilize 4KB sector sizes. Traditional hard disk drives (HDDs) and solid-state drives (SSDs) often use 512-byte or 4KB sector sizes. The 4K patching ensures that the software can efficiently handle and process data on these modern storage systems.