Does anyone know how files are allocated on the disk? Are they fragmented to utilize all the available disk space? With the DVR people tend to run at quite a high disk utilization which would tend to lead to a lot of file fragmentation. On normal computers when the level of fragmentation gets high the computer tends to bog down and run errors occur, so you run some disk defragmentation software and the problems go away. Does the HR20 do any automatic defragmentation and space reallocation? I also assume that the disk is partitioned so that the operating system and run files are partitioned in protected part of the disk.