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Domain Update Notice：UGREEN NAS Official Site has been updated to ai.ugreen.com

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RAID Calculator

Choose the best setup and determine your needs based on storage capacity.

Select drives

HDD SSD
1 TB 2 TB 3 TB 4 TB 6 TB 8 TB 10 TB 12 TB 14 TB 16 TB 18 TB 20 TB 22 TB 24 TB
256 GB 480 GB 512 GB 960 GB 1 TB 1.92 TB 2 TB 3.84 TB 4 TB 8 TB

Total number of drives: 0

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Select RAID type

RAID Types

Reserved for system
Available capacity
Protection
Unused space
Insufficient drives. Add more drives for this RAID configuration.
Insufficient drives. Add more drives for this RAID configuration.
Reserved for system
Available capacity
Protection
Unused space

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Note:

1. Please refer to the Hard Drive Compatibility List to find out which hard drives are compatible with your UGOS Cloud device.
2. The RAID Calculator provides space utilization estimates for various hard drive configurations and RAID types. The UGOS Pro system requires approximately 16 GB of hard disk space (approx. 15.3 GiB) for system partitioning. The actual available hard drive capacity will be affected by the system partitioning and may vary between different hard drive types. The estimated values ​​calculated here may differ from the actual results, and the actual used capacity is subject to the built-in storage manager interface.
3. The results generated by the RAID Calculator are for reference only, and are intended to help you evaluate available space and space utilization when creating new storage space.
4. The RAID Capacity Calculator recommends models based on the selected number of hard drives and compatible expansion devices. Some models may not support hard drives of a certain capacity, so please refer to the Hard Drive Compatibility List for detailed information at any time.
Hard Drive Compatibility List: All use the Hard Drive Compatibility List Query Page on the official website of the corresponding site.

UGREEN RAID Calculator FAQs

Select HDD or SSD, choose your drive size and number of drives, then select a RAID type. The calculator estimates available capacity, protected capacity, reserved system space, and unused space. For a full walkthrough, read how to use a RAID calculator for NAS storage.

The RAID Calculator provides a theoretical estimate. In practice, several factors reduce usable space:

  • System Partitioning: The UGOS Pro operating system requires approximately 16GB of disk space for system files.
  • Binary vs. Decimal (TB vs. TiB): Drive manufacturers define 1TB as 1,000,000,000,000 bytes, while operating systems often use binary (TiB), where 1TiB ≈ 1.1TB.
  • File System Overhead: Formats like Btrfs or ext4 consume a small percentage of space for metadata.

Choose the RAID level before choosing the NAS. Two-bay models are suited to Basic, JBOD, RAID 0, and RAID 1 configurations, while RAID 5, RAID 6, and RAID 10 require more drive bays and model support. After calculating your required drive count and usable capacity, browse UGREEN NAS storage models to find a compatible system.

No. The calculator provides an estimate based on your selected drives and RAID level. Final available capacity may be slightly lower after UGOS Pro system partitioning, file-system metadata, and the difference between decimal TB and binary TiB measurements. UGOS Pro reserves approximately 16GB (about 15.3GiB) for the system partition.

UGREEN NAS does support mixing drives of different capacities. However, we strongly recommend against using drives of varying sizes within the same RAID array.

Standard RAID configurations generally calculate usable capacity using the smallest drive in the array. For example, combining an 8TB drive and a 16TB drive in RAID 1 normally provides approximately 8TB of usable capacity, leaving the additional capacity on the larger drive unused.

The UGREEN RAID Calculator allows you to toggle between HDD and SSD configurations.

  • HDDs are ideal for high-capacity storage at a lower cost (e.g., media libraries).
  • SSDs provide superior speed for active projects, virtualization, or as a high-speed cache. If you’re planning to run virtual machines, our guide to setting up VMs on UGREEN NAS covers the optimal storage configurations for best performance.

For more details, refer to our Hard Drive Compatibility List to ensure your selected drives are supported.

With four equal-size drives, both RAID 6 and RAID 10 provide approximately 50% of raw capacity. For example, four 8TB drives provide about 16TB of usable capacity.

RAID 6 reserves the equivalent of two drives for dual-parity protection and can tolerate two drive failures. RAID 10 combines mirrored pairs with striping; it can tolerate certain two-drive failures, but not two failed drives in the same mirror pair.

Basic creates a separate storage pool on one drive. JBOD combines the capacities of multiple drives into one storage space without redundancy. RAID 0 stripes data across multiple drives and may improve throughput, but it also provides no redundancy. If a drive fails in a JBOD or RAID 0 pool, the combined storage pool and its data may become unavailable.

No. The calculator estimates storage capacity, redundancy allocation, system-reserved space, and unused capacity. It does not calculate network speed, disk throughput, rebuild duration, failure probability, or whether an existing UGOS Pro storage pool can be converted or expanded without recreating it.