Why not use a real monitoring tool? They handle disk space, RAM usage, uptime, etc.

>Recently, I have created a thread about the fact that the .NET Framework does not allow to read NAS drive properties as this is not a Windows drive. After that, in order for our monitoring to detect if 90% of available space has been reached, we relied on a monitoring team, which has roles of doing things like that at the enterprise level. However, before, when we were on a 100% Windows infrastructure, we were able to do it by ourselves.
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>Yesterday, someone suggested to use the DIR command and parse the output to collect the number of free bytes. So, this is good. I cannot obtain the 90% ratio but I can verify that we have a minimum amount of free bytes before sending an alert. Would there by another DOS command that would give me the total available space of the disk?