DLight

dLight reproduces the ubiquitous hard disk activity LED PC users have come to expect for decades.
Modern Apple computers like the iMac and MacBook have near silent hard disk drives.

Sometimes you simply want to know “Why is my computer grinding to a halt?!?” CPU meters only tell half of the story.
dLight is a very light weight mini-application that requires no kernel extensions or fancy installation.
Drag it to your applications folder and launch it.