> ## Documentation Index > Fetch the complete documentation index at: https://docs.gpuhub.com/llms.txt > Use this file to discover all available pages before exploring further. # Local Data Disk > This document explains Local Data Disks, covering capacity, resizing, and billing details. ## Overview 1. The instance's **system disk** and **data disk** are generally local SSDs. 2. Local data disks offer good performance but lack redundant copies. Due to the inherent lifespan of local disks, there is a probability of failure. 3. GPUhub does not provide reliability guarantees or services for such local storage products. The **system disk** is fixed at 30GB and cannot be resized. The **data disk** is fixed to the path `/root/autodl-tmp` and cannot be modified. Important data (e.g., datasets, models) should be regularly backed up to [file storage](/data/file-storage) or local storage. ## Instance Creation When renting an instance, a data disk of 50GB is provided for free. If you need to expand the disk, select a host that supports the required capacity during rental.

## Adjust Capacity Resize operations, both expansion and reduction, are also available after renting. Expanding the instance data disk requires restarting the instance for the changes to take effect.

## Billing For details on data disk billing, please refer to the [pricing](/billing-recharge/billing#data-disk-expansion).