and BD-ROMs. Newer HDDs and SSDs use 4096 byte (4 KiB) sectors, which is known as the Advanced Format (AF).

The sector is the minimum storage unit of a disk drive. Most disk partitioning schemes are designed to have files occupy an integral number of sectors regardless of the file's actual size. Files that do not fill a whole sector will have the remainder of their last sector filled with zeroes. In practice, operating systems typically