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The ext4 filesystem divides the partition it resides into smaller chunks called blocks (a group of sectors, usually between 1KiB and 64 KiB). By default, the block size is the same as the page size (4 KiB), but it can be configured with mkfs during filesystem creation. Blocks are grouped into larger chunks called block groups.
Maximum filename length Allowable characters in directory entries [cc] Maximum pathname length Maximum file size Maximum volume size [cd] Max number of files AdvFS: 255 characters Any byte except NUL [ce] No limit defined [cf] 16 TiB (17.59 TB) 16 TiB (17.59 TB) ? APFS: 255 UTF-8 characters Unicode 9.0 encoded in UTF-8 [96]? 8 EiB (9.223 EB ...
Max volume size: FAT12: 32 MB (256 MB for 64 KB clusters) FAT16: 2 GB (4 GB for 64 KB clusters) FAT32: 2 TB (16 TB for 4 KB sectors) Max file size: 4,294,967,295 bytes (4 GB - 1) with FAT16B and FAT32 [1] Max no. of files: FAT12: 4,068 for 8 KB clusters FAT16: 65,460 for 32 KB clusters FAT32: 268,173,300 for 32 KB clusters: Max filename length
A parallel development in MS-DOS / PC DOS which allowed an increase in the maximum possible FAT size was the introduction of multiple FAT partitions on a hard disk. To allow the use of more FAT partitions in a compatible way, a new partition type was introduced in PC DOS 3.2 (1986), the extended partition (EBR), [ 14 ] which is a container for ...
The partition type (or partition ID) in a partition's entry in the partition table inside a master boot record (MBR) is a byte value intended to specify the file system the partition contains or to flag special access methods used to access these partitions (e.g. special CHS mappings, LBA access, logical mapped geometries, special driver access, hidden partitions, secured or encrypted file ...
ext4: Partition IDs: 0x83 EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 : Structures; Directory contents: Table, hashed B-tree with dir_index enabled: File allocation: bitmap (free space), table (metadata) Bad blocks: Table: Limits; Max volume size: 4 TiB – 32 TiB: Max file size: 16 GiB – 2 TiB: Max no. of files: Variable, allocated at creation time ...
Because file size references are stored in eight instead of four bytes, the file size limit has increased to 16 exabytes (EB) (2 64 − 1 bytes, or about 10 19 bytes, which is otherwise limited by a maximum volume size of 128 PB, [nb 2] or 2 57 − 1 bytes), raised from 4 GB (2 32 − 1 bytes) in a standard FAT32 file system. [1]
ext4 – A follow-up for ext3 and also a journaled filesystem with support for extents. ext3cow – A versioning file system form of ext3. FAT – File Allocation Table, initially used on DOS and Microsoft Windows and now widely used for portable USB storage and some other devices; FAT12, FAT16 and FAT32 for 12-, 16-and 32-bit table depths.