Are you writing one byte at a time, or writing them all in one operation?
Not familiar with the Atmel part, but if it is like the 24C01, if you
are trying to write multiple bytes in one i2c sequence, you can only
write 8 bytes per write cycle  (page mode) - if you write more, it will
just loop in an 8 byte window.  Also, the pages have to be on 8 byte
boundaries - 0-7, 8-15, etc.  i.e., if you write 5 bytes starting at
location 13, those 5 bytes will be written to 13,14,15,8,9.  If you
write 40 bytes starting at 0, you will only see the last 8 bytes end
up in eeprom.

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