struc TrackLayout
 tklSectors     dw SECTORS          ; No. of sectors on track
 tklNumSize     dd SECTORS dup (?)  ; Array of sector numbers and sizes
ends

;       The TrackLayout structure contains an array of numbers and
;       sizes for the sectors on a track.
;
;
;       ; tklNumSize (low word)
;       Specifies the number of the sector. Each sector number must be
;       unique and in the range 1 (one) through the number of sectors
;       specified in tklSectors.
;
;       ; tklNumSize (high word)
;       Specifies the size of the sector, in bytes.
;       All sector sizes must be equal.