xdaf (X11 Disk Activity Feedback) is a small tool to provide a visual feedback of the local disks activity by changing the default X11 mouse pointer to an animated wheel (the wheel is white when the disks are been used for reading and it turns red when writing occurs).
Currently HP-UX and Linux kernel 2.2 and 2.4 are supported (even if the PPC version seems to be broken due to a bug in the kernel).
xdaf should be portable across most UNIX-ish platforms and requires a standard-compliant C compiler such as GCC or HP ANSI-C.
Latest version is A.01.01