left over mb after formatting

[jann1033]

i formatted a cf card in my rebel xt...the card is empty but says it has 18 mb filled....any ideas why? is the camera not reading the the card right or have i just not noticed this when i formatted it before

 

[Kelly Grannell]

It's the 'header' code for the card. Every camera has different header size.

 

[jann1033]

ok so one more thing i never noticed