The option description:
If you decided to set independently hard disk parameters by means of this option you can specify a cylinder count (tracks) of a hard disk. And already for a long time this parameter answers not for physical structure of a disk, and for its logical representation. To learn the correct value it is possible from the description applied on a hard disk or addressed to a sticker on a disk — it individually for each model. Keep in mind, setting of an erratic cylinder count is capable to lead to loss or distortion of the storable information on a disk.
Other options identical to destination: