So far, the HDD was very satisfactory and fast, now then after 16 months ... Blue Screen during the operation and afterwards was not Start and Win 7 system repair of possible (not in safe mode). (Proposed by the other two partitions were to format) in the BIOS, the plate was detected and then Win 8 in the external housing only the boot partition was 100MB recognized Under Knoppix all Partitonen were recognized and it could work data is backed up, but the majority was damaged. BackUp`s thank nix important way :-) The Seatools which were booted under DOS, recognized very many bad sectors and advised for warranty repair. Meanwhile, the HDD to Seagate's go. The support answered very fix (on 3 October!) And explained in detail the exchange procedure.