RAID Calculator

  • 4 TB
  • 3 TB
  • 2.5 TB
  • 2 TB
  • 1.5 TB
  • 1 TB
  • 750GB
  • 640GB
  • 500GB

Drag a HDD here

Step 1 : Pick a HDD and drag it to a HDD tray
Step 2 : Select the RAID type you wish to be compared, and the result will be available immediately
Step 3 : Select the recommended models and compare them

RAID Type RAID Type

Space Available space Used for protection Unused space

  • 0
  • 0
  • 0
  • 0
  • 0
  • 0
  • 0
  • 0

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Notes :
  1. Visit here for more information on choosing the correct HDD for your Synology DiskStation.
  2. Synology RAID Calculator offers you an estimate on the space utilization with various mixed HDD configurations and RAID types. Actual HDD sizes can vary between vendors, and values calculated may differ from actual results. Please refer to Synology Storage Manager for precise data calculations for storage installed in your Synology DiskStation.
  3. When using SHR or SHR-2 HDD protection as your RAID type, the Unused space will be automatically reserved for future expansion. On the contrary, Unused space under other RAID types indicates the space that can't be utilized and is thus wasted.
  4. The result of calculation helps you evaluate the available space when you are creating a new volume only. If you’re going to expand an existing volume, please read Expand Volumes or Disk Groups by Adding Hard Disks and Expand Volumes or Disk Groups by Replacing Hard Disks for detailed information.

SHR (Synology Hybrid RAID)

Minimum HDD required: 2 (with data protection)
Pros: 1 HDD redundancy & optimized volume size. Best used when combining hard disks of varying sizes.

SHR-2 (Synology Hybrid RAID)

Minimum HDD required: 4
Pros: 2 HDD redundancy & optimized volume size. Best used when combining hard disks of varying sizes.

RAID 0

Minimum HDD required: 2
Pros: Data is divided into equal shares and written into the hard disks. Data access is quicker and more efficient.
Cons: If one drive fails, all data is lost and you must restore from additional backup.

RAID 1

Minimum HDD required: 2
Pros: The same data is mirrored to all HDDs. If one drive fails, data integrity will not be affected.
Cons: The available volume is limited to the storage capacity of one HDD.

RAID 5

Minimum HDD required: 3
Pros: It offers 1 HDD redundancy. Data is striped across multiple disks with a parity check bit to the data. If one drive fails, the parity check bit will ensure data integrity.
Cons: The storage capacity of 1 drive is reserved for data integrity check and therefore slightly affects the available volume size.

RAID 6

Minimum HDD required: 4
Pros: It offers 2 HDD redundancy. Data is striped across multiple disks with a parity check bit to the data. The parity check bit ensures data integrity.
Cons: The storage capacity of 2 drives are reserved for data integrity check and therefore slightly affects the available volume size.

RAID 10

Minimum HDD required: 4, the number must be even
Pros: It offers the benefit of both RAID 0 and RAID 1 – data access efficiency and mirroring protection.
Cons: The available volume is half of the total HDD storage capacity.