NTSTATUS 0xC0000031 (STATUS_INVALID_QUOTA

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A proposed quota limit is below storage already charged to the account.

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STATUS_INVALID_PARAMETER_MIX	STATUS_DISK_CORRUPT_ERROR

STATUS_INVALID_QUOTA_LOWER

The new hard limit is lower than current quota usage

Quota policy changes are validated against the amount already charged to the user. Lowering a hard limit beneath current usage would immediately place the account beyond the allowed boundary, so the requested update is rejected.

Freeing arbitrary volume space is not enough; the space must be released from files charged to the affected SID. Ownership and quota charging can differ from the user currently editing the file.

What to inspect

Query QuotaUsed, QuotaThreshold, and QuotaLimit for the exact SID.
Identify which files are charged to that account before changing ownership or deleting data.
Lower the limit only after usage is reduced, or explicitly choose a policy that permits an over-limit state.

References

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