The service area can be called:

System Area
Maintenance Tracks
Negative Cylinders
Reserved Cylinders
Calibration Area
Initialization Area

System Area Information:

SMART data
System Logs
Serial Number
Model Number
P-List – Primary defect list
G-List – Grown defects list
Program overlays – firmware and executable code
RRPO tables
Zone tables
Servo Parameters
Test Routines
Factory defaults table
Recalibration code routines
Translator data
Security data passwords fro the drive