What does Windows error code 705 (ERROR_FT_WRITE_RECOVERY) mean?

ERROR_FT_WRITE_RECOVERY

What ERROR_FT_WRITE_RECOVERY means

A fault-tolerant volume completed a write using redundancy after a member or area failed. In practical terms, this status belongs to redundant storage writes: the file system preserves the write through another copy while reporting degraded storage behavior.

Typical causes

• One member of a mirrored set rejected the write
• The device could not reassign the failing area
• The volume is operating in a degraded but still writable state

How to investigate

1. Collect storage, controller, and disk event logs
2. Confirm redundancy state and whether resynchronization is running
3. Validate that recent backups are usable before replacing hardware

Developer guidance

A successful write does not eliminate risk: redundancy may now be reduced. Capacity planning and hardware replacement should occur before another member fails.

References

• Microsoft: System error codes 500–999