On the 5500 the memory will be wiped, and it will be back in the default state (not factory new, if you\'ve changed ROMs, it will still have that ROM), because the memory is different from the flash memory used in later Zauri. (I could be wrong on this -- I\'m a 5600 owner).
On the 5600, 6000, Cxx0, there will be no harm done, if this happens once or twice. All your information should still be there.