Linux Guide (Seventeen): Disk Partitioning

Disk partitioning is a core concept in computer storage management. In simple terms, it involves dividing a physical hard drive (HDD) or solid-state drive (SSD) into multiple independent logical areas, each of which can be managed, formatted, and used separately. This division does not alter the physical structure of the hard drive but allows the operating system to treat each partition as an independent “virtual disk,” thereby managing data more efficiently.

The Core Functions of Disk Partitioning

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The original intention of disk partitioning is to optimize storage management, with specific functions including:

  1. Data Isolation and Security: It allows the operating system (such as Windows system files) to be stored separately from personal data (documents, photos). For example, if the system partition (usually the C drive) is damaged, the files in the data partition (such as the D drive) can still be retained, reducing the risk of data loss.
  2. Multi-System Coexistence: A single computer can install multiple operating systems (such as Windows and Linux), isolating their system files through partitioning to avoid conflicts.
  3. Improved Management Efficiency: Partitions can be divided by purpose (such as system area, software area, entertainment area), making it easier to classify and locate files; smaller partitions tend to have less file system fragmentation, potentially leading to higher read/write efficiency.
  4. Flexible Space Allocation: Fixed capacities can be allocated for different purposes based on needs (e.g., allocating 100GB for the system area and 500GB for the data area), preventing a single partition from being filled by one type of file.

Partition Table

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The partition table is the “index” of the hard drive, recording information such as the number, location, and size of partitions, which the operating system uses to identify them. Currently, there are two mainstream partition table formats:MBR (Master Boot Record) and GPT (GUID Partition Table).

1. MBR Partition Table (Traditional Format)

  • Background: Introduced in 1983 with the IBM PC, it is the earliest partition table standard with strong compatibility.

  • Core Features::

    • Maximum Hard Drive Capacity Supported: 2TB (hard drives over 2TB cannot be fully recognized). Supports up to 4 primary partitions; or 3 primary partitions + 1 extended partition (multiple logical partitions can be created within the extended partition).
    • Partition Identification: Records partition information using 32-bit data, which can be easily damaged by viruses or user errors.
    • Compatibility: Supports all operating systems (including older Windows XP and Linux), but does not support UEFI boot mode (requires BIOS).

2. GPT Partition Table (Modern Format)

  • Background: Proposed by Intel in 2000 to address the capacity and partition number limitations of MBR, it is the standard for UEFI boot mode.

  • Core Features::

    • Maximum Hard Drive Capacity Supported: Theoretically unlimited (actual limits depend on the operating system and file system, e.g., Windows supports up to 18EB). Supports up to 128 primary partitions (no distinction between extended and logical partitions).
    • Data Redundancy: Partition table information is stored at both the beginning and end of the hard drive, allowing recovery from backups in case of damage, enhancing security.
    • Compatibility: Supports UEFI boot (faster boot speed and enhanced security), but older systems (such as 32-bit Windows XP) do not support GPT (requires third-party tools).

Partition Operation Steps

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Taking Windows 11 as an example:

1. Initializing a New Hard Drive (First Use)

A new hard drive must be initialized first (selecting the partition table format):

  • Right-click on “This PC” → “Manage” → “Disk Management,” which will automatically detect the “uninitialized” hard drive;
  • Right-click on the hard drive (e.g., “Disk 1”) → “Initialize Disk,” select the partition table (recommended GPT, compatible with UEFI boot) → “OK.”

2. Creating a Partition

  • Right-click on the “unallocated” space after initialization → “New Simple Volume”;
  • Follow the wizard to set the partition size (e.g., 100GB) → assign a drive letter (e.g., C) → select the file system (NTFS) → format → finish.

Recommended: Programming Tutorials→Luozhu Programming Assistant

  1. Linux Guide (One): Linux Kernel and Linux System
  2. Linux Guide (Two): Linux Command Line and Graphical User Interface
  3. Linux Guide (Seven): Directory Introduction, Directory Features and Functions, Common Directories
  4. Linux Guide (Nine): User Directories, Home Directories
  5. Linux Guide (Ten): Files, Everything is a File
  6. Linux Guide (Thirteen): Disks

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