Magnetic media specification One of the most important density specifications for magnetic media (such as disks or tapes) is the:

Introduction / Context:
Magnetic storage performance and capacity are influenced by several parameters. Among density metrics, the number of tracks per inch (TPI) is a key measure of how tightly data is packed radially on media.

Given Data / Assumptions:

• Focus is on a specification intrinsic to media density.
• Applies to magnetic disks and tape systems.

Concept / Approach:
TPI directly reflects radial recording density. Higher TPI means more tracks on the surface, increasing potential capacity. While other specs like data transfer rate and RPM affect performance, TPI is a core density metric.

Step-by-Step Solution:
List candidate parameters.Identify which measure represents areal density in one dimension: TPI.Select “tracks per inch” as the answer.

Verification / Alternative check:
Storage datasheets commonly list TPI (radial) and bits per inch (linear) to derive areal density.

Why Other Options Are Wrong:
Rotation speed and data transfer rate are performance metrics, not density measures.Polarity reversal rate and spindle torque are not standard capacity indicators.

Common Pitfalls:
Confusing throughput (MB/s) with capacity density; both matter but measure different aspects.

Final Answer:
tracks per inch