The QNX Neutrino RTOS provides a variety of filesystems, so that you can easily access DOS, Linux, as well as native Power-Safe disks.
The Filesystems chapter of the System Architecture guide describes their classes and features.
Under QNX Neutrino:
A desktop QNX Neutrino system starts the appropriate block filesystems on booting; you start other filesystems as standalone managers. The default block filesystem is the Power-Safe filesystem.