Title: +038=360.000-OU045T_02-PCD2.m4160 PLS SBC - File system Manual.pdf
On the R55Mxx_flash modules, a block is considered either as free (not used yet), as busy (currently used) and freed (has been used at one moment). Freed blocks can not been used until the sector containing the block is erased (all bits set to 1). Only at that moment, a freed block can be re-entered in the free list of blocks.Internally to the file system, some blocks may be marked as freed, but mainly a block is marked as freed when a file / directory is deleted, all associated blocks being re- leased.