My notes on using the Sony NW-S785 walkman with linux, should apply to all NW-S78* models like NW-S784. Looks like this model is sold in Japan only.
This has to be done to do file operations. Do not disconnect the walkman while it is mounted!
tail -f /var/log/messages & # start watching the logs # now onnect the walkman, it can be accessed with the usual linux usb-storage driver. # if everyting goes well usb_storage gets loaded and you the A826 gets available as a new device. # You should get an output like 'sda: sda1', saying you can access the A826 under /dev/sda1. # If that doesnt happen try to manually load the driver: modprobe usb_storage # - if that still doesnt work check if usb-drivers are loaded and the A826 comes up as usb-device at all. mkdir -p /mnt/walkman # creates a mountpoint if not existant # now lets mount the S785, use your device here. # The option ensures that we properly see UTF8 encoded filenames mount -t vfat -o iocharset=utf8 /dev/sdc1 /mnt/walkman