Sorry, I'll try to be more specific. I am not using the OSE version, I know that that version has no USB support.
I am using version 1.6.2.
These are the steps I have taken in attempt to getting the Sansa USB problem to work:
1) plug in Sansa and unmount it from the desktop. I had heard that it needs to be unmounted so that the guest can access it. I have also attempted this with it mounted.
2) I go to the USB settings for the virtual machine and add the Sansa filter.
3) I power on the machine and download Windows Media Player 11.
4) The device is not detected, so I checked in My Computer and it was not there.
5) I went in the "Devices" menu at the top of the virtual machine engine, scrolled down to "USB Devices" and discovered that the status of the Sansa was listed as "Unavailable"
These are the steps I have taken in attempt to getting the shared folder problem to work.
1) I used the VirtualBox Settings menu to add the shared folder "sda2".
2) I read section 4.5 of the instructions manual dealing with Folder sharing.
3) Per instructions, In the windows xp guest I opened the command line and entered the following code:
net use x: \\vboxsvr\sda2
4) I recieved the following error:
Sytem error 67 has occurred.
The network name cannot be found.
comment:: I have previously recieved the same error and eventually gotten the folder sharing to work. However, I can not for the life of me recall how.
I hope this is enough info to diagnose the problems.
Note: I do not know what USBFS is from your line
"Look for USBFS for MP3"
Could you please specify or explain.
Much thanks,
M4rotku