# Storage classes
A **Storage Class** defines the physical storage where internal and external files must be stored when entering **Data Mover**. It also determines where incoming files are **temporarily stored** before a transfer is completed.
Data Mover supports the following Storage Classes:
* SMB v3 or later
* Azure Blob Storage
* Amazon S3
* Google Storage
* Local File System
Files stored in these Storage Classes are uploaded through a **VFS (Virtual File System)** connected to a remote provider.
To learn how to configure a VFS, see the [Create a virtual file system](/data-mover-1.21/virtual-file-systems/create-a-virtual-file-system.md) page.
### Accessing Storage Classes
To access Storage Classes, go to **Setup** → **Storage Classes**.
The Storage Classes page will appear, displaying a list of all configured Storage Classes.
You can sort results by clicking the icon next to the column header. When sorting text values, entries with uppercase letters are listed before lowercase ones.
A **toolbar** is available at the top of the list. Learn how to use it [here](/data-mover-1.21/getting-started/navigate-through-primeur-data-mover.md#the-toolbar).
For each Storage Class, you can also click on the 3-dot menu to:
* Edit the Storage Class
* Delete the Storage Class
{% hint style="danger" %}
If a Storage Class is linked to a VFS or VFS Path, it cannot be deleted.
{% endhint %}
On the right side of the screen, the **Filters panel** allows you to refine the list. Note that the **Search storage class** field is **case‑sensitive.**
The **date and time of the last page update** are displayed at the top of the Filters panel.
### Creating a Storage Class
To create a new Storage Class, click **New** and complete the fields required for the selected storage type:
* [SMB v3 or later versions](/data-mover-1.21/virtual-file-systems/storage-classes/storage-class-smb-v3-or-later-versions.md)
* [Azure Blob Storage](/data-mover-1.21/virtual-file-systems/storage-classes/storage-class-azure-blob-storage.md)
* [Amazon S3](/data-mover-1.21/virtual-file-systems/storage-classes/storage-class-amazon-s3.md)
* [Google Storage](/data-mover-1.21/virtual-file-systems/storage-classes/storage-class-google-storage.md)
* [Local File System](/data-mover-1.21/virtual-file-systems/storage-classes/storage-class-local-file-system.md)
#### Symmetric Key association
When configuring a Storage Class, you can select a **Symmetric Key** to **encrypt all files** stored through that Storage Class.
The **Symmetric Key** is selected from a drop-down menu in the **Encryption key** section of each Storage Class creation page.
Only Symmetric Keys that have been previously created under **Setup** → **Key Store** → [Symmetric keys](/data-mover-1.21/security/key-stores-and-trust-stores/key-store/creating-a-symmetric-key.md) are available for selection.
{% hint style="info" %}
If one or more files are already associated with the Storage Class, the Symmetric Key field becomes **read‑only**. The Storage Class must be empty in order to associate or change a Symmetric Key.
{% endhint %}
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