Number of sectors per track in hard drive?

Question

Is the number of sectors fixed for each track in a hard drive? I am wondering about this because most hard drive specifications give an accurate value for sectors/track rate. I am confused because I would imagine the inner tracks should contain less sectors than the outer tracks.

Answer 1

Number of sectors per track
(more sectors on the outside as apposed to the tracks near the spindle,)
ATA/IDE drives were much more efficient at storing data and have replaced the now archaic MFM and RLL drives. They use zone bit recording (ZBR), where the number of sectors dividing each track varies with the location of groups of tracks on the surface of the platter.
Tracks nearer to the edge of the platter contain more blocks of data than tracks close to the spindle,because there is more physical space within a given track near the edge of the platter.
Thus, the CHS addressing scheme cannot correspond directly with the physical geometry of such drives, due to the varying number of sectors per track for different regions on a platter. Because of this, many drives still have a surplus of sectors (less than 1 cylinder in size) at the end of the drive, since the total number of sectors rarely, if ever, ends on a cylinder boundary.
For reff.
See MFM and RLL drives and below ATA/IDE drives:- See History

Answer 2

Yes, the number of the sectors per track is a fixed size because on all tracks there is a servo sector with the same number: http://hddscan.com/doc/HDD_Tracks_and_Zones.html. Maybe this has changed with the new Zonebit-Recording.