Prestos Hard Drive Monitor is the app to track information about the level of utilization of RAM and disk. In the settings you can adjust the number of displayed disks. Accordingly, the more disks the more space on your desktop is your app. If the indicator is red – this means that disk space was running out. Yellow – the drive is quite busy, green – all OK, have a seat. PR you hover your mouse on any of the disks will open additional information about the amount of drive, its free and busy place.