It also avoids having to write the change twice, as happens with an HFS+ journaled file system, where changes are written first to the journal and then to the catalog file. This avoids corrupted records containing partial old and partial new data caused by a crash that occurs during an update. Instead of overwriting existing metadata records in place, it writes entirely new records, points to the new ones and then releases the old ones, an approach known as redirect-on-write. Crash protection Īpple File System is designed to avoid metadata corruption caused by system crashes. Data integrity Īpple File System uses checksums to ensure data integrity for metadata but not for user data. Increased maximum number of files ĪPFS supports 64-bit inode numbers, supporting over 9 quintillion files (2 63) on a single volume.
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