Sentry-go Quick Disk Monitor - Version 4.1 The Sentry-go Quick Disk Monitor allows you to quickly & easily check available disk space on your local PC or server. Running as Windows service, checks can be made periodically without any user action, checking for either a given amounto f space (Mb) or percentage disk space free. If insufficient space is found, the monitor can automatically take corrective action to delete temporary files & free up space.