External disk unusable

Question: I had an external usb drive with two partitions functioning fine in Time machine as backup, using 1 partition (the other one beeing NFTS formatted). Size partition being ca. 80 gB I tried to repartition it so my volume would be bigger.
Since then no backups possible (can' t write to the last block of device, partitioning impossible)
Formatting in FAT or whatever is not possible anymore. Everytime I start external disk " can' t read disk by computer" , " initialize disk". But initializing isn' t possible. Erasing and formatting neither.
Tried Stallar partitioning manager. No dice. Fdisk commands are to cryptic. What is possible solution?
Runs in 10.7.2 Lion

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