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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.

Yes, but it is usually inefficient. Standard RAID levels use the smallest drive size across the array, so larger drives may leave unused space. For example, mixing 4TB and 8TB drives can make the 8TB drive behave like a 4TB drive in the RAID pool. Before buying drives, check the Hard Drive Compatibility List.

Standard RAID levels (like RAID 5 or 6) typically use the capacity of the smallest drive across all disks. For example, if you mix 4TB and 8TB drives in RAID 5, the system will only use 4TB from each drive.

This is why drive matching matters when you’re planning a RAID setup, especially if you want to avoid paying for capacity you can’t use. Our guide on choosing the best RAID level breaks down how different RAID types handle mixed drive sizes and what to consider before expanding your array.

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.

Use RAID 1 for 2-bay NAS setups. RAID 1 mirrors your data across both drives, so one drive can fail without immediate data loss. For setup guidance, read choosing the best RAID level.

Use RAID 5 for most 4-bay NAS setups. RAID 5 gives a strong balance of usable capacity, speed, and protection against one drive failure. If data protection matters more than usable space, consider RAID 6 or RAID 10.

Basic uses a single drive as its own storage space. JBOD combines multiple drives into one larger space but does not add redundancy. RAID 0 stripes data across drives for speed and full capacity, but if one drive fails, the whole RAID 0 array can be lost.

RAID 5 protects against one drive failure and is efficient for 4-bay setups. RAID 6 protects against two drive failures but uses more capacity. RAID 10 gives strong speed and protection, but it requires at least four drives and uses about half the raw capacity.