Expansion planning
Replace drives from an inventory, not a guess.
List the capacities already in the array, select the layout, then see the capacity checkpoint after each smallest-drive replacement.
Drive inventory planner
Plan the replacement sequence from the drives you already own.
List the decimal drive labels, choose a constrained array model, and compare each smallest-drive replacement before buying a batch.
The values below are editable planning baselines. Change the few inputs you know; open Advanced assumptions only when they change your decision.
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Replacement sequence
Replace the smallest drives first.
| Step | Replace | Modelled usable capacity | Capacity change |
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Upgrade brief
Keep the drive sequence with the platform checks.
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Next decision
Plan tools
Keep this useful version close, shareable, and easy to revisit.
Recent saved plans 0
TB
Editorial record
Maintained by Make Your Own Tools to turn “Store data safely” into a defined capacity, bays, redundancy, and recovery baseline. The references below provide the technical context for this planning path. Its calculation rules and planning assumptions are documented in the methodology, and affected calculations pass regression checks before the review date advances.
- Last reviewed
- Evidence set
- 3 primary references
- Planning scope
- A single mirror, RAID 5, RAID 6, RAID 10, or SHR-1 drive inventory where every planned replacement uses the same larger-capacity drive class.
- Next check
- Disk health, rebuild duration, vendor compatibility, platform firmware behavior, ZFS vdev expansion, or the repair and expansion actions required by a particular system.
Synology drive replacement and expansion guidancePlatform-specific conditions for capacity changes after drive replacement.Open source ↗Synology RAID CalculatorCapacity estimation for supported Synology drive combinations.Open source ↗TrueNAS ZFS Capacity CalculatorZFS capacity, redundancy, and configuration-planning reference.Open source ↗