cdrom_msf and cdrom_ti question

[Torbj�rn Kristoffersen]

Hello, I'm making a CD Player (Hobby project).

My question is; what is the difference between 
        struct cdrom_msf
            and
        struct cdrom_ti
             ?
             
I'm using struct cdrom_ti to play audio tracks, but when I try to play
the last track (this fails on every cd) it wont't play.
Every track but the last track works, isn't that weird?
One of my ideas is that maybe it has something to do with my use of
'ti' instead of 'msf'?

Torbj�rn S. Kristoffersen