# Data Disk

Data Disk is elastic block storage service provided by Zenlayer for Virtual Machine Instances and provides low latency, high performance, high durability, and high reliability. Data Disk uses a distributed triplicate mechanism to copy your data within the location to ensure data durability and availability.

{% hint style="info" %} <mark style="color:blue;">**Note**</mark>

<mark style="color:blue;">The information about data disk in this document is applicable to the data disk created together with the VM instance.</mark>
{% endhint %}

## **Data Disk Limits**

A disk can be attached only to a single VM instance in the same location.

| Item                                        | Limits                                                          |
| ------------------------------------------- | --------------------------------------------------------------- |
| Maximum number of data disks on an instance | 10 (including the data disk created together with the instance) |
| Capacity of a single data disk (GB)         | 20 - 2000                                                       |