I have a spare drive for my RAID. How often should I re-certify it?

A spare drive should be periodically re-certified to ensure it is ready for immediate use if a drive in your RAID fails. Drives that sit unused for long periods can develop latent issues that may not be detected until the drive is placed into service.

Re-Certification Intervals

We recommend the following re-certification schedules based on usage environment:

• Mission-critical environments: Re-certify spare drives every 3–6 months
• Professional environments: Re-certify spare drives every 6–12 months
• Prosumer or home use: Re-certify spare drives once per year

A spare drive that has not been re-certified within these timeframes should not be assumed to be deployment-ready.

Why Re-Certification Matters

Drives degrade while idle:

• Lubricants in HDDs can settle or deteriorate
• Flash cells in SSDs can lose charge over time
• Firmware issues may develop
• Manufacturing defects may only appear under load

Re-certification ensures:

• The drive can still reliably read and write across its entire surface
• No new bad sectors or reallocated sectors have appeared
• The drive is truly ready for immediate deployment when needed

Storage Best Practices for Spare Drives

For HDDs:

• Store in a cool, dry environment
• Keep in anti-static bags if removed from enclosure
• Avoid extreme temperature changes

For SSDs:

• Store with at least 50% charge/data written
• Power on and connect once every 6 months (even if not certifying)
• SSDs can lose data if left unpowered for extended periods (6-12 months)

Important: RAID is Not a Backup

While RAID protects against individual drive failures, it does not protect against:

• Accidental deletion
• File corruption
• Malware or ransomware
• Site-wide disasters (fire, flood, theft)
• User error

We strongly recommend the 3-2-1 backup rule:

• Maintain at least 3 copies of your data
• Keep 2 copies on-site (e.g., RAID + separate backup drive)
• Keep 1 copy off-site (cloud backup or physically separate location)

Using both RAID and proper backups provides the best protection for important data.