GPart написал:
/dev/sda contains GPT signatures, indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should. Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Is this a GPT partition table?
...ну и соответственно, да/нет. Дословный перевод от гугла мне ничего не сказал(((( Что это означает? И как дальше...