Such a perfect day, drink sangria in the park..
"To explain sibling links, first you need to understand that most directory information on Macintosh disks is stored in data structures that are technically known as B*-trees. Examples of B*-trees on a Macintosh disk include the Catalog File, the Extents Overflow File, the Desktop Database, the Users & Groups File, and several others.
Each tree has a number of data records; for example, each record within the Catalog tree describes one file or one folder. The records are sorted and indexed for fast searching. But for efficiency, the records are also grouped into fixed-length blocks called nodes; because these nodes can be physically scattered around the B*-tree file, they need pointers to indicate their logical ordering. So a given node has a "forward link", which points to the node containing records that are logically immediately after the records in the current node; likewise, a node has a "backward link", pointing to the node containing logically preceding records. If these linkages are pointing to the wrong place, some files or folders might be inaccessible. Or the OS could even hang up trying to find some. This makes the link invalid."
In pratica, mi si è sbrandato il MacBook Pro.E devo reinstallare.
Tutto questo senza praticamente usarlo.
Si sarà offeso.