A master boot record (MBR) is the first sector ("sector zero") of a data storage device. What is the size of MBR?

The correct answer is D. 512 Bytes. The Master Boot Record (MBR) is always exactly 512 bytes in size - one sector on traditional hard drives. This fixed-size structure contains the boot loader code (446 bytes), the partition table (64 bytes, holding up to four 16-byte entries), and a boot signature (2 bytes…

Submitted by carter_n· Apr 18, 2026Disk Forensics

Question

Options

ADepends on the capacity of the storage device
B1048 Bytes
C4092 Bytes
D512 Bytes

How the community answered

(22 responses)

A
5% (1)
C
9% (2)
D
86% (19)

Explanation

The Master Boot Record (MBR) is always exactly 512 bytes in size - one sector on traditional hard drives. This fixed-size structure contains the boot loader code (446 bytes), the partition table (64 bytes, holding up to four 16-byte entries), and a boot signature (2 bytes: 0x55AA). Because MBR is tied to the legacy 512-byte sector standard, its size does not vary based on the storage device's capacity.

Topics

#Master Boot Record#Disk Structure#Storage Devices

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