---
slug: /tir/block-storage
sidebar_position: 7
title: "Block Storage"
description: >-
  Fixed-size disks for AI/ML workloads, mounted read-write with low-latency
  access and resizable capacity. Previously known as Datasets (Disk).
---

import { BlockStorageBadges, BlockStorageQuickStart, BlockStorageCapabilities, BlockStorageAPIDoc, BlockStorageBilling } from './BlockStorageCards'

# Block Storage

Block Storage, previously known as **Datasets (Disk)**, gives you disks of a fixed size that you allocate. They mount **read-write once** — on one [Instance](/docs/tir/Nodes/instances) (container) or [Virtual Machine](/docs/tir/VirtualMachines/virtual-machines) at a time — which makes them the right choice for scratch space, high-speed caching, and any step that has to write to its mount directory.

In the TIR portal it lives under **Storage > Block Storage**.

<BlockStorageBadges />

<BlockStorageQuickStart />

---

## One Workload at a Time

**Block Storage is read-write once: each disk mounts read-write on only one resource at a time.** If it is already mounted elsewhere, the portal says so when you try to attach it — unmount it there first.

---

## API Reference

<BlockStorageAPIDoc />

## Billing & Plans

<BlockStorageBilling />

<BlockStorageCapabilities />