ITPEC IP April 2023 Question 2
ITPEC IP April 2023 — Question 2 of 100
A 2-Tbyte hard disk is specified as 2 × 10¹² bytes under the decimal prefixes commonly used for storage-device capacity. The SI prefix tera means 10¹². Binary quantities use powers of two and are more precisely named with prefixes such as tebibyte, where 1 TiB equals 2⁴⁰ bytes.
Answer (a)
Why not others:
- (b) dpi means dots per inch, not dots per square centimeter
- (c) giga means 10⁹ for clock frequency, so 3.3 GHz is 3.3 × 10⁹ Hz, not 3.3 × 2²⁰ Hz
- (d) 56 kbps denotes about 56 × 10³ bits per second and is a rated speed, not the stated minimum of 5.6 × 2¹⁰
Key rule: Decimal SI prefixes are k = 10³, M = 10⁶, G = 10⁹, and T = 10¹²; dpi is a linear density per inch.
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