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1. Identify the exact NAS or RAID controller
Record the full NAS model and hardware revision, or the RAID controller’s model, firmware, driver, and configuration-utility version. A chipset name alone may not be enough: a finished controller card or NAS vendor can set its own compatibility and software limits.
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Also note the operating-system or NAS software version and the exact hard-drive model you plan to install. A capacity such as 20 TB is not a complete compatibility check; drive model, interface, form factor, firmware, and sector format may matter.
2. Check the manufacturer’s drive-compatibility list
Use the NAS or controller manufacturer’s current compatibility list, searching by the exact device and drive type. Confirm the listed drive model, capacity, interface, form factor, and any firmware requirement. The list may change as manufacturers validate new hardware or firmware.
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- Synology: Select the product model in the compatibility list, then inspect the available drive capacities to find the maximum single-drive capacity shown for that model.
- QNAP: Check the NAS and drive combination in QNAP’s drive-compatibility guidance.
If your exact drive is not listed, do not assume that a similar model or a drive with the same advertised capacity is officially supported. Check the device maker’s notes or ask its support team before relying on it.
3. Separate the different capacity limits
“Maximum capacity” can refer to several different things. Check each layer independently; a high total pool capacity does not prove that every individual drive size is supported.
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| Capacity layer | What to verify |
|---|---|
| Single physical drive | Whether the device recognizes and supports the exact drive model and its full capacity. |
| RAID array or controller logical drive | Whether the controller and its management software can create a logical drive of the intended size for the selected RAID level. |
| Storage pool | Whether the NAS or operating system supports the total capacity of the drives in the pool. |
| Partition and operating system | Whether the partition style and OS can address the desired capacity and number of partitions. |
| Volume and filesystem | Whether a single volume can use the intended portion of the pool after filesystem metadata and other limits are accounted for. |
Synology explains that raw capacity and single-volume size are separate; the pool and volume size depend on drive count, RAID configuration, and filesystem metadata. Consult its capacity guidance and the specifications for the exact product. For example, the DS1522+ specification applies to that product, not to all Synology devices.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors4. Verify the controller’s logical-drive limit
Read the manual and release notes for the exact controller and software version, looking for maximum logical-drive size, supported RAID levels, and any capacity restrictions. Do not substitute a chipset family’s specifications for the documentation covering the complete controller and its firmware.
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- Store more and work faster with a NAS-optimized hard drive providing 8TB and cache of up to 256MB
- Purpose built for NAS enclosures, IronWolf delivers less wear and tear, little to no noise/vibration, no lags or down time, increased file-sharing performance, and much more
- Easily monitor the health of drives using the integrated IronWolf Health Management system and enjoy long-term reliability with 1M hours MTBF
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For example, a historical LSI MegaRAID configuration guide states a 2 Tbytes maximum logical-drive size for the RAID levels and controller/software context it describes. That is a product-specific historical limit, not a rule for current RAID controllers. Check your own controller’s documentation rather than applying that figure elsewhere.
5. Check partition format and operating-system support
Physical-drive recognition and partitioning are separate issues. Microsoft recommends GPT for a modern system that needs large-drive support and more than four partitions: “Use GPT if you have a modern system with UEFI firmware and need support for large drives and more than four partitions.” See Microsoft’s Disk Management guidance for the applicable Windows instructions.
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- Available in capacities ranging from 2 to 22TB(1) | (1) 1GB = 1 billion bytes and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment.
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- Rated for 550TB/yr workload rate(2) | (2) Annualized Workload Rate = TB transferred x (8760 / recorded power-on hours). The maximum rated workload is specified for operating at typical temperature of 40C. Workload Rate will vary depending on your hardware and software components and configurations.
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An older Windows 8.1/Server 2012 R2 “New Volume” workflow illustrates how an MBR-based path could impose a 2-TB volume ceiling. Treat that as a version- and workflow-specific example, not as a universal limit on physical hard drives. Confirm the partition style and volume procedure supported by your own operating system.
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6. Confirm RAID and pool-expansion rules
Drive support for a new array does not automatically mean the drive can be added to an existing pool. Check the rules for your RAID level and current pool, including drive-type mixing, minimum or matching capacities, and whether expansion is supported in place.
For Synology DSM 7, the pool expansion instructions specify drive-type and drive-size rules for adding disks. Those rules apply to that software and vendor; other NAS platforms and RAID controllers may behave differently.
7. Verify capacity at every layer after installation
Before putting data at risk, compare what the controller, NAS storage manager, operating system, and volume manager report. If one reports less capacity than another, locate the first layer showing the discrepancy before changing partitions, expanding a volume, or rebuilding an array.
Quick Recap
- If the drive is missing or its model is not identified correctly, recheck the physical interface, connection, firmware, and device compatibility list.
- If the drive is recognized but shown with less capacity, check controller limits and configuration-software documentation.
- If the controller sees the expected size but the OS or volume does not, check partition style, OS support, volume limits, and filesystem rules.
- If an existing pool will not accept the drive, check its expansion rules and the pool’s current drive composition before making changes.
What to have confirmed before buying
- The exact NAS or controller model and relevant firmware or software versions.
- The exact drive model, interface, form factor, capacity, and any listed firmware or sector-format requirements.
- The maximum supported single-drive size, distinguished from array, pool, logical-drive, and volume limits.
- Supported RAID and expansion rules for your intended configuration.
- Whether your partition format, operating system, and filesystem can use the capacity you plan to allocate.
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