Other useful utilities on ext filesystems are attributes, which are characteristics of files, we can view attributes with
lsattr to view attributes
or we can change attributes with:
chattr +i fileName
the attributes "i" says that now the file is not deletable, there are many flags, and it is recommended to view them by doing a " man chattr", for example a good way to reduce I/O is to tell the OS to not save date and hour informations on disk with a certain flag, which is "A" (very useful for laptops), it is a good idea for the Orlov block allocator to set the /home directory with a " T" flag, since its subdirectories are not related and can be on separated disk's blocks.