suballocation การใช้

,the most widely used read-write file systems with support for block suballocation are Btrfs and block level fragmentation " ).
Some block suballocation schemes can perform allocation at the byte level; most, however, simply divide up the block into smaller ones ( the divisor usually being some power of 2 ).
With an 8 KiB block suballocation, however, the file would occupy just 6 KiB of the second block, leave 2 KiB ( of the 8 KIB suballocation block ) slack and free the other 24 KiB of the block for other files.
With an 8 KiB block suballocation, however, the file would occupy just 6 KiB of the second block, leave 2 KiB ( of the 8 KIB suballocation block ) slack and free the other 24 KiB of the block for other files.
Because of this, BSD added " block-level fragmentation ", also called block suballocation, tail merging, or tail packing, where the last partial block of data from several files may be stored in a single " fragment " block instead of multiple mostly empty blocks.