Event assuming that you can look at the source code for your filesystem/kernel the results of a given write still depend on the conditions and orders under whic

Event assuming that you can look at the source code for your filesystem/kernel the results of a given write still depend on the conditions and orders under which your writes hit disk relative to other processes' writes. For example, if two processes issue writes to disk sectors that are adjacent but one of the processes' writes also affects a different sector farther away on the physical disk the I/O scheduler may re-order processes' sector level writes. Normally journalling addresses this issue but if the journalling transactions are reordered then it's no help at he application level.