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Studio render of a hard drive platter rendered as stacked translucent discs, partitions and volumes separated by thin copper rings

Topic · 2 min read

Disks, volumes and file systems

The storage space visible to an application is organized through several layers above the physical medium. A disk, a partition, a volume, and a mounted file system each describe a different part of that organization.

The bigger picture

Partition information divides addressable space, logical-volume arrangements can combine or represent storage, and file systems organize names and content. The operating system then exposes mount points or drive letters for applications. Counts at these different layers do not need to match because the relationships are not always one-to-one.

A file manager intentionally presents a simpler view than a storage-management tool. Neither view alone explains every physical device or reserved region. The following topics are read-only conceptual references. They do not provide formatting, partition deletion, initialization, or recovery instructions. Understanding the labels before acting is particularly important because management operations can change how existing data is accessed.

Reading map: Disks, volumes and file systemsFirst 1 topics in reading order: The bigger picture. Each topic links to its section or page.INSIDE THIS PAGEDisks, volumes and file systems1The bigger picture2 paragraphs

Storage

Note these before you change anything

Useful facts to have to hand while reading about disks, volumes and file systems.

  • A current backup before any change
  • Controller mode in firmware: AHCI, RAID or NVMe
  • Storage controller driver name and version
  • Drive health shown by the maker's own diagnostics

Storage: Reading and writing data

  1. File systemfiles and folders
  2. Storage stackvolumes and partitions
  3. Controller driverNVMe, AHCI or RAID
  4. Controlleron the board or a card
  5. DriveSSD or HDD
Conceptual schematic of a selected path, not every request. Shown in one direction; the reverse direction uses related layers. Real systems add services, filter drivers and firmware not shown. Highlighted: the layer a driver change affects.

Pages in Disks, volumes and file systems

Thumbnail for Partitions and logical volumes: a long machined aluminium bar divided into three anodised, set beside a hard drive platter rendered as stacked (Disks, volumes and file systems)Reference · 2 min read

Partitions and logical volumes

A partition describes a region within an addressable storage layout, while a volume is a logical unit the operating system can use. In simple arrangements…

Thumbnail for What a file system organizes: a frosted acrylic block containing a branching copper tree, set beside a hard drive platter rendered as stacked (Disks, volumes and file systems)Reference · 2 min read

What a file system organizes

A file system supplies rules and metadata for organizing named files and directories on storage. It turns a set of addressable locations into a structure…

Thumbnail for Write caching and persistence: a small acrylic tray holding machined blocks queued before, set beside a hard drive platter rendered as stacked (Disks, volumes and file systems)Reference · 2 min read

Write caching and persistence

Write caching allows a storage path to acknowledge or organize work before every part has necessarily reached persistent media. It can improve efficiency…

Thumbnail for Storage health information and limits: an SSD on a precision measuring plate beside a, set beside a hard drive platter rendered as stacked (Disks, volumes and file systems)Reference · 2 min read

Storage health information and limits

Storage devices can report operational measurements and status through supported interfaces. These reports provide context about the device, but they are…

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