what I have noticed is the boot partition contains the boot and config files but nothing else the problem lies in the next partition the 500mb one, if you recopy the firmware files from the buffalo updater back into the boot partition as per the link I used for instruction then it will overwrite and extract them into the second partition when you turn it back on, bimble about a bit reboot then come back up.
the only problem I found was changing the web interface setting to english from japanese which once you know where to look becomes nice and easy. once done you can then reallocate the shares folder, unit name etc..
while its stripped down though you can also have another look at the twonky stuff or similar - nothing I've read fills me with hope on the cut and paste doability of it.
now mines working I've got another broken one coming off ebay for the laff as the drive is worth what I paid for the unit and I might have a mess around and see if I can get something working. for media though I have a mediagate mg35ndas which is lousy as a nas thanks to windows 7 but a really good media player which sees the other nas and can play the files. I can also run it as a barebones media player with no drive which is handy