HDD Led Indicator is described as 'This is a hard disk activity monitoring tool. It displays the activity of the disk in the same manner as PC HI-DISK led does..Useful when PC HI-DISK led is not in sight or is missing. It's free to try, but in demo mode you are just prompted to register and nothing more' and is an app in the os & utilities category. There are three alternatives to HDD Led Indicator for Windows. The best HDD Led Indicator alternative is Atlas Hard Drive LED, which is free. Other great apps like HDD Led Indicator are Activity Indicator and Free HDD LED.
I use HDD Led Pro that works just fine. However during the past week I got some weird issues so I tried Activity Indicator. My impression is that it could be better but it is very cumbersome. To begin with you must run the software as many times as disks you use in order to display the activity of each one. Deleted.