Datasheet

corresponds to block size of a Mifare Classic card). For example, if you specify that you want to read page 3, in reality

pages 3, 4, 5 and 6 will be read and returned, and you can simply discard the last 12 bytes if they aren't needed. If you

select a higher page, the 16 byte read will wrap over to page 0. For example, reading page 14 will actually return page

14, 15, 0 and 1.

"Write" requests occur in pages (4 bytes), so there is no problem with overwriting data on subsequent pages.