Total Disk Space?

Total Disk Space?

Is there anywhere in the database that the toal disk space is stored? I'm trying to calculate the capacity for each server, but the only values I see are the disk utilization percentage and the disk utilization in MB. In addition, the disk utilization percentage doesn't have any significant numbers (no decimals) so I can't reliably calulate the total disk usage...especially if a disk is under 1%.

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