Question

Consider a magnetic disk pack with 32 surfaces, I28 tracks/surface. 256 sectors/track and 512 bytes sector. If the inner track diameter is 21 cm;
What is the maximum recording density in that track?

• A. 8 K bytes/cm
• B. 4 K bytes/cm
• C. 2 K Bytes/cm
• D. 2 K bits/cm

Answer 1

The correct option is C 2 K Bytes/cm

$\text{Data storage capacity of a track}=256\times 512Bytes$

$\text{Parameter of the inner track}=\pi \times D=\frac{22}{7}\times 21cm=66cm$

$\Rightarrow 66.cm\text{is used to store}256\times 512Bytes.$

$\therefore \text{One cm capacity}=\frac{256\times 512}{66}Bytes$

= 2 K Bytes.