Flash the developer image, connect via serial, when the player comes up, press q then return to drop to a shell...
Then fsck it as you would any other linux box.. =)
Good luck... =)

Jazz
(List 112, S/N 00030, 4 gig blue)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)