Physical range of blocks that cannot be used Volume array of virtual object identifiersĪrray of counters storing container information Maximum possible number o volumes in container Identifier for container object map physical object Identifier for Space Manager logical object Number of blocks in data segment used by superblock Index of first valid element in data segment Number of blocks in descriptor segment used by superblock Index of first valid element in descriptor segment Next identifier for new logical or virtual objectĭescriptor base address or physical object identifier with address treeĭatabase address or physical object identifier with address tree The value to verify reading a Container Superblock.īitmap for container’s main features (read-only)īitmap for container’s incompatible features The Container Superblock is the highest level in the file system. This B-tree contains entries for each volume with its ID and offset.
To map block IDs to block offsets a pointer to a B-tree block map is saved. In addition, the block identifiers (IDs) of all volumes are stored in the superblock.
The Container Superblock contains information on the block size, the number of blocks and pointers for this task in the space manager. Because of the file system structure with containers and flexible volumes, allocation needs to be processed at the container level. The CS ( Container Superblock) is the entry point to the file system. Positionįrom the table, we can see that 1uint = 1 bit, 8 bit = 1 byte, hence uint64 = 8, uint32 = 4, and uint16 = 2 bytes. Other information in the header includes the copy-on-write version of the block, the block identifier (id) and the block type. Block HeaderĮach element of the file system structure in ApFS starts with a block header. Partitions formatted in ApFS are not recognized by OS X 10.11 Yosemite and earlier versions of the operating system. This is far from being a complete list of the innovations that ApFS can boast. You can use several encryption keys to ensure data security even in the case of ”physical compromise” of the medium. This will reduce the number of failures in data transfer and other file operations.ĪpFS has a built-in encryption system and uses AES-XTS or AES-CBC systems, depending on the device.
In HFS+, timestamps were set to the nearest second. The new file system uses nanoseconds to set timestamps. With a 64-bit index, ApFS volumes will support up to 9 quintillion (1018) files.
DATA RESCUE 4 APFS SOFTWARE
Each container contains one or more volumes or file systems, each of which has its own namespace, and a set of files and directories.Īlthough ApFS does not directly support software RAID, but it can be used with Apple RAID volumes to support Striping (RAID 0), Mirroring (RAID 1), and Concatenation (JBOD). They have their own crash protection and disk space allocation scheme. It is composed of the following parts:Ĭontainers are usually exactly the same as the GUID Partition Table (GPT) entries. The element that follows it is the body of the file system. Each element of this structure (except for the allocation file) starts with a 32-byte block header, which contains some general information about the block.
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