Buffer I/O error on device mtdblock2,

[major]

Hello

i ve got an used goflex net.
when i tried to recover the device i got following errors:

end_request: I/O error, dev mtdblock1, sector 0
Buffer I/O error on device mtdblock1, logical block 0
end_request: I/O error, dev mtdblock0, sector 1920
end_request: I/O error, dev mtdblock0, sector 1920
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock2, sector 0
uncorrectable error :
end_request: I/O error, dev mtdblock2, sector 8
uncorrectable error :
end_request: I/O error, dev mtdblock2, sector 16
uncorrectable error :
end_request: I/O error, dev mtdblock2, sector 24
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock2, sector 0
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock1, sector 0
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock1, sector 8
uncorrectable error :
end_request: I/O error, dev mtdblock1, sector 16
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock1, sector 24
uncorrectable error :
uncorrectable error :
end_request: I/O error, dev mtdblock1, sector 0
end_request: I/O error, dev mtdblock0, sector 1920
end_request: I/O error, dev mtdblock0, sector 1920


the rescue system is booting and usb boot is also working.
but i want to know how can recover the errors on mtdblock 0, 1 and 2.
pls give me a hint....

mfg

major