> For the complete documentation index, see [llms.txt](https://8bitmods.gitbook.io/manuals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://8bitmods.gitbook.io/manuals/bitlink-dc-dongle/features/memory-cards.md).

# Virtual memory cards

The dongle stores four virtual memory cards (VMCs) in internal storage. Each card is the size of a standard VMU (128 KB). The Dreamcast sees the mounted card as a VMU in the controller's first slot.

* Card 1 is mounted when the dongle starts.
* To change cards, select a card on the WebUI **VMU** page and select **Mount**. With the BitLink DC Adapter, you can also press its Sync button.
* Saves are written to internal storage about a second after the game stops writing. Wait a moment after saving before you unplug the dongle.

If a VMU is plugged into a controller fitted with the BitLink DC Adapter, the console uses that VMU instead of the virtual cards.

To back up, restore or copy saves, see [Memory card manager](/manuals/bitlink-dc-dongle/webui/memory-cards.md).

## Notes

* The virtual cards are not available while a keyboard or mouse is connected. See [Keyboards and mice](/manuals/bitlink-dc-dongle/inputs/keyboards-and-mice.md).


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