# Disk

A Disk chart is a capacity indicator. It shows how much of something has been used compared to how much is available.

It always answers one question:

**“How full is this?”**

### What a Disk chart shows

A Disk chart displays:

`used ÷ total → percentage`

The chart is drawn as a ring:

* **Filled area**: used portion
* **Empty area**: remaining portion
* **Center number**: percent used

<figure><img src="https://2948796384-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LmzGprckLqwd5v6bs6m%2Fuploads%2F3PWPDhcHrkjz1tNRiQ2g%2FScreenshot%20from%202026-01-10%2009-01-28.png?alt=media&#x26;token=32a8bb7c-39a4-4f88-a781-b0d184c2a8e4" alt="Example Disk chart showing percent used as a ring"><figcaption><p>Disk chart (capacity indicator)</p></figcaption></figure>

### Configure a Disk chart

Disk charts are designed for bounded metrics. They assume you have two numbers:

* **Used**
* **Total**

{% hint style="info" %}
Key rules:

* Disk charts use a bounded metric (a value with a max).
* The chart computes: `(used / total) × 100`.
* Ensure `total > 0` to avoid invalid percentages.
  {% endhint %}

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