# Best 4TB NAS Drive in 2026: 3 CMR Drives Compared Three CMR 4TB NAS drives from Seagate, WD and Toshiba compared on published specs: RV sensors, transfer rate, workload, warranty, power and noise. - URL: https://homelabpicks.com/drives/best-4tb-nas-drive/ - Published: 2026-03-15 - Updated: 2026-09-30 - Evidence: research-backed > HomeLabPicks earns a commission on qualifying purchases made through https://homelabpicks.com/go/ links. Prices change; check the retailer before buying. Disclosure: https://homelabpicks.com/disclosure/ ## Verdict **[Seagate IronWolf 4TB](https://homelabpicks.com/go/seagate-ironwolf-4tb)**: Our 4TB pick: CMR, RV sensors, a 202 MB/s rating, low power, IronWolf Health Management on supported NAS systems, and three years of Rescue data recovery. ## Products ### Our Pick: [Seagate IronWolf 4TB](https://homelabpicks.com/go/seagate-ironwolf-4tb) The default 4TB NAS drive. Seagate's datasheet lists RV sensors, a 1 to 8 bay rating, a 202 MB/s transfer rating and 3.2 W idle power, plus IronWolf Health Management on supported NAS systems and three years of Rescue Data Recovery. - Model: ST4000VN006 - Recording: CMR - RPM: 5,400 - Cache: 256 MB - Rated transfer: 202 MB/s - Workload: 180 TB/year - Idle power: 3.2 W - Warranty: 3 years plus 3 years of Rescue Pros: - RV sensors and a 1 to 8 bay rating - IronWolf Health Management on supported NAS systems - Three years of Rescue Data Recovery included - Low power at 3.2 W idle and 3.7 W average operating Cons: - 5,400 RPM, rated about 13% slower than the N300 4TB - 3-year warranty; the IronWolf Pro 4TB offers 5 years ### WD Alternative: [WD Red Plus 4TB](https://homelabpicks.com/go/wd-red-plus-4tb) A solid CMR NAS drive that WD rates for systems with up to 8 bays. The IronWolf 4TB has a higher transfer rating and more NAS features: WD lists 180 MB/s and no RV sensors, and there is no bundled recovery service. Buy it if it costs less when you shop or you want to match existing WD drives. - Model: WD40EFPX - Recording: CMR - RPM: 5,400 - Cache: 256 MB - Rated transfer: 180 MB/s - Workload: 180 TB/year - Idle power: 3.1 W - Warranty: 3 years Pros: - CMR, confirmed on WD's datasheet for the WD40EFPX - NASware firmware and dual-plane balance control - Lowest idle power of the three at 3.1 W Cons: - No RV sensors listed - Lowest transfer rating of the three at 180 MB/s - No bundled data recovery service - Easy to confuse with the plain WD Red WD40EFAX, which WD lists as SMR ### Fastest: [Toshiba N300 4TB](https://homelabpicks.com/go/toshiba-n300-4tb) The fastest-rated 4TB drive here. Toshiba lists 232 MB/s, a 7,200 RPM spindle and RV sensors. The trade-offs are higher power draw and no bundled recovery service or IronWolf-style health integration. - Model: HDWG440 - Recording: CMR - RPM: 7,200 - Cache: 256 MiB - Rated transfer: 232 MB/s - Workload: 180 TB/year - Idle power: 4.0 W - Warranty: 3 years Pros: - Highest transfer rating of the three at 232 MB/s - RV sensors built in - CMR, 180 TB/year workload rating, 1 million hours MTTF Cons: - Highest power here at 4.0 W active idle and 6.8 W operating - No bundled data recovery service - No NAS health integration like IronWolf Health Management ## Comparison | Product | RPM | Cache | Rated transfer | Workload rating | Warranty | RV sensors | Idle power | | --- | --- | --- | --- | --- | --- | --- | --- | | [Seagate IronWolf 4TB](https://homelabpicks.com/go/seagate-ironwolf-4tb) (winner) | 5,400 | 256 MB | 202 MB/s | 180 TB/yr | 3 yrs + 3 yrs Rescue | Yes | 3.2 W | | [WD Red Plus 4TB](https://homelabpicks.com/go/wd-red-plus-4tb) | 5,400 | 256 MB | 180 MB/s | 180 TB/yr | 3 yrs | Not listed | 3.1 W | | [Toshiba N300 4TB](https://homelabpicks.com/go/toshiba-n300-4tb) | 7,200 | 256 MiB | 232 MB/s | 180 TB/yr | 3 yrs | Yes | 4.0 W | The 4TB tier makes sense when you're filling a NAS on a tight budget, replacing a single failed drive, or building a small mirror where redundancy matters more than raw capacity. Price per terabyte varies by capacity, so compare current offers with the [8TB tier](https://homelabpicks.com/drives/best-8tb-nas-drive/) before you commit. All three drives here are CMR (Conventional Magnetic Recording), according to their datasheets. SMR drives slow down badly during RAID rebuilds and long writes; for the full breakdown, see our [CMR vs SMR guide](https://homelabpicks.com/drives/cmr-vs-smr-nas/). The product cards above list each drive's full specs. --- ## Our Pick: Seagate IronWolf 4TB The [Seagate IronWolf 4TB](https://homelabpicks.com/go/seagate-ironwolf-4tb) (ST4000VN006) is the safest all-round choice at 4TB. - 5,400 RPM, 256 MB cache, CMR - 202 MB/s maximum sustained transfer - 180 TB/year workload rating, 1 million hours MTBF - 3.2 W idle, 3.7 W average operating; 23 dBA idle, 25 dBA seek (Seagate ratings) - 3-year warranty plus three years of Rescue Data Recovery Seagate lists RV sensors on the 4TB model and rates it for NAS systems with 1 to 8 bays. IronWolf Health Management adds drive-health recommendations on supported NAS systems (confirm support with your NAS vendor). AgileArray firmware provides dual-plane balancing and time-limited error recovery, which limits how long the drive retries a bad sector so a RAID array is less likely to drop it. Rescue Data Recovery covers Seagate's in-lab recovery service for three years where the service is offered. Treat it as insurance, not a backup. At 202 MB/s, the IronWolf outruns a 1GbE link, which carries at most 125 MB/s before protocol overhead. If you have 2.5GbE or faster networking, the Toshiba N300 is rated faster. --- ## WD Alternative: WD Red Plus 4TB The [WD Red Plus 4TB](https://homelabpicks.com/go/wd-red-plus-4tb) (WD40EFPX) is a solid CMR NAS drive, but the IronWolf 4TB has a higher transfer rating and more NAS features. - 5,400 RPM, 256 MB cache, CMR - 180 MB/s transfer rating - 180 TB/year workload rating, 1 million hours MTBF - 3.1 W idle, 4.7 W read/write; 23 dBA idle, 27 dBA seek (WD ratings) - 3-year warranty The critical detail: buy the **Red Plus** (WD40EFPX), not the plain WD Red WD40EFAX, which WD lists as SMR. WD's current Red Plus datasheet lists every Red Plus model as CMR. For more on WD's naming, see [IronWolf vs WD Red Plus](https://homelabpicks.com/drives/ironwolf-vs-wd-red-plus/). WD tunes the Red Plus with NASware firmware and dual-plane balance control, and rates it for NAS systems with up to 8 bays, but it does not list RV sensors. There is no bundled recovery service and no IronWolf Health Management. Choose it when it costs less than the IronWolf when you buy, or when you want matching WD drives for an existing array. --- ## Fastest: Toshiba N300 4TB The [Toshiba N300 4TB](https://homelabpicks.com/go/toshiba-n300-4tb) is the performance option, with a 7,200 RPM spindle and the highest transfer rating here. - Model HDWG440: 7,200 RPM, 256 MiB buffer, CMR - 232 MB/s sustained transfer (Toshiba rating) - 180 TB/year workload rating, 1 million hours MTTF - 4.0 W active idle, 6.8 W operating - 3-year warranty That rating is about 15% above the IronWolf's 202 MB/s. You will see the difference only on 2.5GbE or faster networks moving large files; over 1GbE, the network is the limit. Toshiba builds in RV sensors, as Seagate does. The trade-offs are power and extras. The N300 draws the most power of the three: at $0.18 per kWh, its 0.8 W higher idle draw than the IronWolf costs about $1.30 per drive per year. There is no bundled recovery service or IronWolf-style health integration. --- ## Buying Criteria: What to Look for in a 4TB NAS Drive ### CMR vs SMR Recording This is the single most important spec. CMR writes tracks side by side without overlap. SMR overlaps tracks to fit more data, so the drive must rewrite whole bands to change a small piece of data, which hurts sustained writes and RAID rebuilds. Every drive on this page is CMR. Full details are in our [CMR vs SMR guide](https://homelabpicks.com/drives/cmr-vs-smr-nas/). ### Workload Rating All three drives are rated for 180 TB/year, about 490 GB per day of reads and writes combined. A home NAS serving media, nightly backups and file shares rarely approaches that; continuous surveillance recording or a busy multi-user backup target might. For most [home lab NAS builds](https://homelabpicks.com/nas/best-nas-home-lab/), 180 TB/year is plenty. ### RPM and Sequential Throughput Seagate rates the IronWolf 4TB at 202 MB/s, WD rates the Red Plus 4TB at 180 MB/s, and Toshiba rates the N300 4TB at 232 MB/s. Over 1GbE, all three saturate the link. On 2.5GbE (312.5 MB/s), the N300's higher rating can help with large sequential transfers. ### Cache Size All three list 256 MB of cache (Toshiba states 256 MiB). Cache mostly helps bursts of small random reads and writes rather than long sequential transfers. ### Warranty and Data Recovery Seagate includes three years of Rescue Data Recovery with the IronWolf. WD and Toshiba offer standard 3-year warranties without a recovery service. If your backups are solid, Rescue is a nice extra rather than a must-have. ### RV Sensors Seagate lists RV sensors on the IronWolf 4TB, and Toshiba builds them into the N300. WD does not list them for the Red Plus. They matter more as the number of drives in a chassis rises, so for a 5-bay or larger NAS, stick with the IronWolf or N300. --- ## How to Choose **Most builds, including Synology and QNAP:** Buy the [Seagate IronWolf 4TB](https://homelabpicks.com/go/seagate-ironwolf-4tb). RV sensors, low power, IronWolf Health Management and Rescue make it the most complete option. **Fastest transfers on 2.5GbE or faster:** Buy the [Toshiba N300 4TB](https://homelabpicks.com/go/toshiba-n300-4tb) for its 232 MB/s rating, if you can accept higher power draw and no extras. **Matching an existing WD array, or a better price on the day:** Buy the [WD Red Plus 4TB](https://homelabpicks.com/go/wd-red-plus-4tb), and confirm the model is WD40EFPX. --- ## Bottom Line The [Seagate IronWolf 4TB](https://homelabpicks.com/go/seagate-ironwolf-4tb) is the best 4TB NAS drive for most home lab builders: RV sensors, a 202 MB/s rating, low power, IronWolf Health Management and Rescue data recovery. The [Toshiba N300 4TB](https://homelabpicks.com/go/toshiba-n300-4tb) is the fastest-rated option. The [WD Red Plus 4TB](https://homelabpicks.com/go/wd-red-plus-4tb) is a solid alternative when it costs less or you want to match WD drives. All three are CMR, all three are designed for 24/7 operation, and all three carry 3-year warranties. For a broader look at NAS drives across all capacities, see our [complete NAS drive guide](https://homelabpicks.com/drives/best-hard-drive-for-nas/). For NAS hardware to put these drives in, see [best NAS for home lab](https://homelabpicks.com/nas/best-nas-home-lab/). ## FAQ ### Is 4TB enough for a NAS drive? It depends on your bay count. Four 4TB drives in RAID 5 give about 12TB usable, enough for a Plex library, Time Machine backups and Docker volumes. Two 4TB drives in RAID 1 give only 4TB usable, which fills fast. If you're building a 2-bay NAS and need more room, consider 8TB drives instead. ### Are all three of these drives CMR? Yes. Seagate, WD and Toshiba list the ST4000VN006, WD40EFPX and HDWG440 as CMR. Do not confuse the WD Red Plus with the plain WD Red WD40EFAX, which WD lists as SMR and which does not belong in a NAS array. ### Does RPM matter for NAS drives? Less than it seems. Toshiba rates the 7,200 RPM N300 4TB at 232 MB/s, against 202 MB/s for the 5,400 RPM IronWolf 4TB and 180 MB/s for the WD Red Plus 4TB. Over 1GbE, which carries at most 125 MB/s before overhead, all three outrun the network. On 2.5GbE or faster, the N300's extra speed can show up in large sequential copies. ### Can I mix different brand NAS drives in a RAID array? Yes. Mixing brands of the same capacity, such as an IronWolf and a Red Plus, works in typical RAID and ZFS setups. Some builders mix brands on purpose so that one batch problem is less likely to affect every drive at once. ### IronWolf vs IronWolf Pro, do I need Pro for a home NAS? Usually not. Both have RV sensors. The IronWolf Pro 4TB (ST4000NT001) steps up to 7,200 RPM, a 550 TB/year workload rating, 2 million hours MTBF and a 5-year warranty, which matter more for heavy, always-busy arrays than for a 2-bay or 4-bay home NAS. ## Sources - [Seagate IronWolf 3.5 HDD data sheet (DS1904.21)](https://www.seagate.com/content/dam/seagate/migrated-assets/www-content/datasheets/pdfs/ironwolf-18tb-DS1904-21-2207US-en_US.pdf) (accessed 2026-09-29) - [Seagate IronWolf Pro 3.5 HDD data sheet (DS2129.4)](https://www.seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/ironwolf-pro-12tb/ironwolf-pro-20tb-DS2129-4-2311US-en_US.pdf) (accessed 2026-09-29) - [WD Red Plus data sheet (September 2025)](https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/internal-drives/wd-red-plus-hdd/data-sheet-western-digital-wd-red-plus-hdd.pdf) (accessed 2026-09-29) - [Toshiba N300 NAS hard drive data sheet](https://toshiba.semicon-storage.com/content/dam/toshiba-ss-v3/master/en/storage/product/internal-specialty/HDD-NSENA.pdf) (accessed 2026-09-29) - [Toshiba N300 product page (warranty and RV sensors)](https://storage.toshiba.com/consumer-hdd/internal/n300) (accessed 2026-09-29) - [Western Digital: SMR drives by capacity (July 2020)](https://blog.westerndigital.com/wp-content/uploads/2020/07/WD_SMR_SKUs_vDS.pdf) (accessed 2026-09-29)