Here is a small guide to mount PFS3 formated CF-cards with AmigaOs.4.1
1. Download PFS3 from Aminet
http://aminet.net/package/disk/misc/pfs3aio and install PFS3_aio-handler to L/
2.Plug in your PFS3 formated CF-card, make a reset
3.You will not see your PFS3 formated at Workbench
4.Open MediaToolbox, choose usbdisk.device, choose your CF-card
5.Choose a partition of your CF-card, right MBT and choose "Save RDB as Mountlist" then choose "DOSDrivers"
Save mountlist to Storage/DOSDrivers and NOT to DEVS/DOSdrivers because if you save it to DEVS/DOSDrivers and your CF-card is not installed, you will get error messages like "Device xxx is not installed" at startup
6.Open tooltypes of the saved mountlist file in Storage/DOSDrivers/ and chhose as Default tool C/Mount and in the tooltypes ACTIVATE=1
7.Before you startup your Amiga, install now your CF-Card, double click in Storage/DOSDrivers the mountlist like DH0 etc. and you will see your mounted device at Workbench
Note: It is important to give your CF-card another name like your Amiga partition. If your Amiga have DH0,DH1,DH2 etc take for your CF-card GDH0,GHD1,GHD2 etc
If your Amiga partition is SYS: then take another name for your CF-card partition like Workbench etc.Otherwise, this can lead to problems