Thanks for your help, I would like to ask one more question:
How do you use !TimerUpdate? I have:
*Timer HDDCUpdate #sl 10m !execute [!parseEvars !setEvar HDDcU %[remove(diskInUse('c:', GB), 'GB')]% ][!parseEvars !setEvar HDDcT %[remove(diskTotal('c:', GB), 'GB')]% ][!parseEvars !setEvar HDDbarCW %#HDDcU/HDDcT*108%# ][!parseEvars !labelModifyOverlay systems hdd_c_used_ 4 132 %#HDDbarCW+1%# 20][!parseEvars !labelModifyOverlay systems hdd_c_avail_ %#HDDbarCW+3%# 132 %#107-HDDbarCW%# 20]

Ideally I would like to set the time to 10ms then use a !TimerUpdate at the end to switch it to a 10m countdown, so I don't have to wait 10m for the first draw.

Working on prettying it up atm mainly, then might add the 'minimise' functionality I want.