https://support.apple.com/en-mide/111336
If you have an external storage device, such as a USB or Thunderbolt drive, you can install macOS on that device, then use it as a Mac startup disk.
how to useexternal storage devicemac
https://support.microsoft.com/en-au/windows/move-your-files-to-a-new-windows-pc-using-an-external-storage-device-dd139b2e-bc73-4431-8e6e-c96e10dffdf5
Learn how to move files to a new Windows PC using an external storage device like a USB drive, SD, card, or external hard drive.
a newwindows pcmovefilesusing
https://www.vive.com/eu/support/vive-xr/category_howto/transferring-files-between-internal-and-external-storage.html
You can connect an external storage device to your headset and transfer files between them.
external storage devicefilesheadset