Final answer:
Swap space in a separate disk partition without a file system requires special routines for block allocation and deallocation, as it directly manages raw disk blocks for paging purposes.
Step-by-step explanation:
For swap space created in a separate disk partition where no file system or directory structure is placed, special routines must be used to allocate and deallocate the blocks. Swap space operates differently than regular file system storage because it is used by the operating system for paging or swapping information directly from RAM to disk and vice versa. Unlike file systems that manage data through a structured hierarchy of files and directories, swap space works at a lower level, dealing directly with disk blocks. Therefore, it requires special management routines that are capable of handling raw disk blocks independently of the traditional file system mechanisms.