> For the complete documentation index, see [llms.txt](https://docs.foundryosd.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.foundryosd.com/foundry-osd/media/update-usb.md).

# Update a USB drive

Update existing Foundry USB media when configuration or runtime content changes.

## Before updating

* Confirm that the selected drive is Foundry deployment media.
* Confirm that required offline cache content is stored outside the boot partition that Foundry updates.
* Close applications that may be using files on the USB drive.
* Review the current configuration because the update uses the active Foundry OSD settings.

## Update the drive

1. Connect the existing Foundry USB drive.
2. Open **Start** and select the correct target.
3. Confirm Foundry recognizes the drive as existing Foundry media.
4. Resolve readiness items.
5. Select **Update USB**. Foundry refreshes the boot partition while preserving the cache partition.
6. Keep the drive connected until the update completes.
7. Test boot the updated media before production use.

<figure><img src="/files/wAEh0SDhiSO7mmhVB5Qx" alt="Foundry OSD showing recognized deployment media and the Update USB action"><figcaption><p>Update recognized Foundry USB media without rebuilding its cache partition or re-downloading cached Windows sources.</p></figcaption></figure>


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