---
page_title: "VirtualBox Shared Folders - Synced Folders"
sidebar_current: "syncedfolder-virtualbox"
---

# VirtualBox

If you're using the VirtualBox [provider](/v2/providers/index.html), then
VirtualBox shared folders are the default synced folder type. These synced
folders use the VirtualBox shared folder system to sync file changes from
the guest to the host and vice versa.

## Caveats

There is a [VirtualBox bug][sendfile bug] related to `sendfile` which can result
in corrupted or non-updating files. You should deactivate `sendfile` in any
web servers you may be running.

In Nginx:

    sendfile off;

In Apache:

    EnableSendfile Off

[sendfile bug]: https://github.com/mitchellh/vagrant/issues/351#issuecomment-1339640