physical geometry
The physical
At the time the PC BIOS interfaces to the hard disk were designed, hard disks were simple. They had only a few hundred cylinders, a few heads and all had the same number of sectors in each track. Today’s drives do not have simple geometries; they use zoned bit recording and therefore do not have the same number of sectors for each track, and they use defect mapping to remove bad sectors from use. As a result, their geometry can no longer be described using simple “CHS” terms. These drives must be accessed using logical geometry figures, with the physical geometry hidden behind routines inside the drive controller. Often, you have to request detailed specifications for a modern drive to find out the true physical geometry.
Tip: It’s easy to tell if you are looking at physical or logical hard disk geometry numbers. Since no current hard drive has the same number of sectors on each track, if you are given a single number for “sectors per track”, that must be a logical parameter. Also, I am aware of no current hard disk product that uses 8 platters and either 15 or 16 heads. However, all modern, larger IDE/ATA hard disks have a nominal logical geometry specification of 15 or 16 heads, so either of those numbers is a dead giveaway.
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