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SK0-004 · Question #687

A technician installed a new 2GB hard drive on a server, but it only shows 1.86GB of unformatted space. Which of the following is a reason for the difference?

The correct answer is A. Manufacturers use base 10 instead of base 2 in advertising disk space. Hard drive manufacturers measure capacity in decimal (base 10) units while operating systems report in binary (base 2) units, causing a consistent apparent size reduction.

Server hardware installation and management

Question

A technician installed a new 2GB hard drive on a server, but it only shows 1.86GB of unformatted space. Which of the following is a reason for the difference?

Options

  • AManufacturers use base 10 instead of base 2 in advertising disk space.
  • BA swap file is added to the drive automatically, reducing available disk space.
  • CThe disk controller maps out a section of hard drive space for diagnostics.
  • DDisk drivers consume space of the hard drive.

How the community answered

(51 responses)
  • A
    92% (47)
  • B
    2% (1)
  • C
    2% (1)
  • D
    4% (2)

Why each option

Hard drive manufacturers measure capacity in decimal (base 10) units while operating systems report in binary (base 2) units, causing a consistent apparent size reduction.

AManufacturers use base 10 instead of base 2 in advertising disk space.Correct

Manufacturers define 1 GB as 1,000,000,000 bytes (base 10), but operating systems use binary units where 1 GB equals 1,073,741,824 bytes (base 2). A 2,000,000,000-byte drive therefore displays as approximately 1.86 GB (2,000,000,000 divided by 1,073,741,824) in the OS, which precisely explains the observed discrepancy.

BA swap file is added to the drive automatically, reducing available disk space.

A swap file is only created after the OS is installed on a formatted volume, not on a brand-new unformatted drive.

CThe disk controller maps out a section of hard drive space for diagnostics.

While controllers may remap bad sectors dynamically, this does not account for the consistent and predictable ~7% reduction seen uniformly across all new drives.

DDisk drivers consume space of the hard drive.

Disk drivers are software loaded into system RAM at runtime, not stored on the drive itself, so they consume no hard drive space.

Concept tested: Binary vs. decimal storage capacity unit measurement

Topics

#disk capacity#base 10 vs base 2#storage advertising#disk space

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