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🗄️ RAID Capacity Calculator

Configure the RAID level, drive count, and hot spares to calculate the usable capacity and fault tolerance. You can copy the calculation results as formatted text with a single click.

RAID Level Details & Minimum Drive Requirements
RAID 0 Speed / Cap
Min Drives 2
Fault Tol. 0
Efficiency 100%
Disk 1
Data A
Data C
Disk 2
Data B
Data D
Splits data evenly across drives with no parity. Offers maximum speed and utilizes 100% capacity, but if one drive fails, all data is lost.
RAID 1 Mirroring
Min Drives 2
Fault Tol. N - 1
Efficiency 1 / N
Disk 1
Data A
Data B
Disk 2
Data A
Data B
Replicates identical data onto multiple drives. Highly secure, but overall usable capacity is limited to a single drive's size.
RAID 5 Balanced
Min Drives 3
Fault Tol. 1
Efficiency (N-1)/N
Disk 1
Data A
Data C
Parity P
Disk 2
Data B
Parity P
Data D
Disk 3
Parity P
Data E
Data F
Strips data and parity across all drives. Standard balance of safety, capacity, and performance. Survives 1 drive failure.
RAID 6 Dual Parity
Min Drives 4
Fault Tol. 2
Efficiency (N-2)/N
Disk 1
Data A
Parity P
Parity Q
Disk 2
Parity P
Parity Q
Data B
Disk 3
Parity Q
Data C
Parity P
Disk 4
Data D
Data E
Data F
Adds double parity blocks to survive up to 2 simultaneous drive failures. Highly recommended for large capacity storage pools.
RAID 10 Speed & Safe
Min Drives 4 (Even)
Fault Tol. 1 to N/2
Efficiency 50%
D1
Data A
Data C
D2
Data A
Data C
D3
Data B
Data D
D4
Data B
Data D
Combines mirroring (RAID 1) and striping (RAID 0). Superb read/write speed and robust protection, utilizing 50% of total capacity.
RAID 50 High Speed & Red.
Min Drives 6 (Even)
Fault Tol. 1 to 2
Efficiency (N-2)/N
D1
A1
P
D2
P
A2
D3
A3
A4
D4
B1
P
D5
P
B2
D6
B3
B4
Combines RAID 5 arrays inside a RAID 0 stripe. Faster than RAID 5 and can survive 1 failed drive per sub-group (up to 2 maximum).
RAID 60 Ultra Red. & Speed
Min Drives 8 (Even)
Fault Tol. 2 to 4
Efficiency (N-4)/N
D1
A1
P
Q
D2
P
Q
A2
D3
Q
A3
P
D4
A4
A5
A6
D5
B1
P
Q
D6
P
Q
B2
D7
Q
B3
P
D8
B4
B5
B6
Combines RAID 6 arrays inside a RAID 0 stripe. Designed for ultra-high security and scale, withstanding up to 2 failed drives per sub-group (up to 4 maximum).
RAIDZ3 Triple Parity
Min Drives 5
Fault Tol. 3
Efficiency (N-3)/N
D1
Data A
P
Q
R
D2
P
Q
R
Data B
D3
Q
R
Data C
P
D4
R
Data D
P
Q
D5
Data E
Data F
Data G
Data H
ZFS filesystem implementation using triple parity. Allows surviving 3 simultaneous drive failures. Ideal for ultra-large archives.
💡 Hot Spare Count:
A Hot Spare is a standby drive that automatically replaces a failed drive. It minimizes downtime and data loss risk by starting the rebuild process immediately after a failure.
CONFIGURATION
4 drives
0 drives
4 TB
Total Physical Drives (Bay Count) 4 drives
RAID Level Usable Capacity (Storage Efficiency) Fault Tolerance Status
RAID 0
16 TB (100%)
 0 (No redundancy) Available
RAID 1
4 TB (25%)
 3 drives Available
RAID 5
12 TB (75%)
 1 drive Available
RAID 6
8 TB (50%)
 2 drives Available
RAID 10
8 TB (50%)
 1 〜 2 drives Available
RAID 50
 - - Min 6 drives
RAID 60
 - - Min 8 drives
RAIDZ3
 - - Min 5 drives
RAID 0
Available
Usable Capacity
16 TB (100%)
Fault Tolerance
0 (No redundancy)
RAID 1
Available
Usable Capacity
4 TB (25%)
Fault Tolerance
3 drives
RAID 5
Available
Usable Capacity
12 TB (75%)
Fault Tolerance
1 drive
RAID 6
Available
Usable Capacity
8 TB (50%)
Fault Tolerance
2 drives
RAID 10
Available
Usable Capacity
8 TB (50%)
Fault Tolerance
1 〜 2 drives
RAID 50
Min 6 drives
Usable Capacity
-
Fault Tolerance
-
RAID 60
Min 8 drives
Usable Capacity
-
Fault Tolerance
-
RAIDZ3
Min 5 drives
Usable Capacity
-
Fault Tolerance
-