P.S.: I remember there was a little piece of software called "Disk Light". It does exactly what the name says, i.e. it visualises the harddisk access with the impression of a flickering LED in a corner of the screen.

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Norton Disk Light. Some hate it, some love it.I love being able to tell when I have HDD activity and used it up until I moved to OS X but when I installed it on my beige G3 recently(internal SSD = no read/write sound or indicators) it bombed during boot so now I must live without it or find out why it is bombing.

Let me know if you need it but cannot find it.