+In the new system the blocks of a file are more optimally
+ordered on the disk.
+Even though reads are still synchronous,
+the requests are presented to the disk in a much better order.
+Even though the writes are still asynchronous,
+they are already presented to the disk in minimum seek
+order so there is no gain to be had by reordering them.
+Hence the disk seek latencies that limited the old file system
+have little effect in the new file system.
+The cost of allocation is the factor in the new system that
+causes writes to be slower than reads.
+.PP