Example:
Device/server has multiple hard drives—200 GB, 1 TB. The check is set to Critical at 90% → Fine for the 200 GB drive, as 20 GB fills up quickly, but on the 1 TB drive, the threshold is already at 100 GB → too early...
Solution:
An option in the hard drive check to specify that absolute values (rather than percentages) are used once a minimum hard drive size is reached.