Configure FSRM Quota
How to install File Server Resource Manager, build a reusable quota template (e.g. 500 MB hard quota with an 85% warning threshold), apply it to a folder, and test that hard enforcement returns the same not-enough-space error a full disk would. Includes the New-FsrmQuotaTemplate / New-FsrmQuota PowerShell equivalents for scripting many folders, the NTFS-quotas-vs-FSRM-quotas trade-off, and 6 common pitfalls (auto-apply at the wrong root, hard quota on an already-over folder, missing SMTP, edited-quota-not-matching-template, permission errors masquerading as quota issues, SrmSvc stopped).