> For the complete documentation index, see [llms.txt](https://www.osdeploy.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.osdeploy.com/powershell-modules/osdeploy/update-osdeploybootusb.md).

# Update-OSDeployBootUSB

Updates an existing OSDeploy USB drive with new BootMedia from an OSDeployCore BootImage build.

| Property | Value                                                                                                      |
| -------- | ---------------------------------------------------------------------------------------------------------- |
| Module   | OSDeploy                                                                                                   |
| Platform | Windows 11 (amd64 / arm64)                                                                                 |
| Requires | Run as Administrator, a completed BootImage build, a USB drive previously created by `New-OSDeployBootUSB` |

## Description

Refreshes the BootMedia files on one or more existing OSDeploy USB drives without reformatting or repartitioning. The function:

* Prompts for selection of a completed BootImage from `%ProgramData%\OSDeployCore\boot`
* Prompts for the specific bootmedia folder (`bootmedia` or `bootmedia_ca2023`)
* Locates all connected USB volumes whose label matches `-BootLabel` (default: `OSDEPLOY`)
* Copies the selected media to each matching USB volume using `robocopy`
* Writes a `BootMedia.json` file to each updated volume

No partitioning or formatting is performed. Use `New-OSDeployBootUSB` to create a new bootable USB drive.

## Syntax

```powershell
Update-OSDeployBootUSB [-BootLabel <String>] [-DataLabel <String>] [-WhatIf] [-Confirm]
```

## Parameters

| Parameter    | Type     | Required | Description                                                                                                          |
| ------------ | -------- | -------- | -------------------------------------------------------------------------------------------------------------------- |
| `-BootLabel` | `String` | No       | Volume label used to identify USB boot partitions to update. Max 11 characters. Default: `OSDEPLOY`.                 |
| `-DataLabel` | `String` | No       | Volume label used to identify the USB data partition when copying ESD files. Max 32 characters. Default: `OSDCloud`. |

## Examples

```powershell
# Update all connected USB volumes labeled 'OSDEPLOY'
Update-OSDeployBootUSB
```

```powershell
# Update all connected USB volumes labeled 'WinPE'
Update-OSDeployBootUSB -BootLabel 'WinPE'
```


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