A second advantage offered by the cache is the possibility of batching multiple pages together to write them contiguously to disk. This idea was first proposed in the VAX/VMS operating system [9]. This can be easily implemented as the system does not need to decide the physical location of a set of pages until they are really sent to the disk. Furthermore, as the pages are compressed, many more pages are written in a single disk write, thus decreasing the time spent on disk accesses.