che schema partizioni ha quel disco?
i lacie in ogni caso lamentano dei problemi.Time Machine might refuse to back up files past a certain point unless you have repartitioned the backup drive to remove any master boot record. Only Apple Partition Map and GUID partitioning is acceptable.
http://www.macfixit.com/LaCie USB drives We're hearing of cases where an external LaCie drive, although seen by the Finder, is not seen by Time Machine. LaCie is giving the same advice we gave earlier: repartition the drive. But some users are reporting that this isn't helping. In some cases there seems to be a difference between USB and FireWire; for example, Time Machine might not back up to the drive when it is connected via USB, but will do so when the very same drive is connected via FireWire.
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