Exact 12TB WD Red Plus comparison
WD120EFGX vs WD120EFBX
Compare the two current 12TB Red Plus models: a faster 512MB air-filled drive and a much quieter, lower-power 256MB helium-filled alternative.
Specifications reviewed August 2, 2026 · Amazon US offers where relevant · Verify exact model and compatibility
Quick answer
Which one should you choose?
Choose WD120EFGX for maximum rated sequential performance: up to 260MB/s and 512MB cache. Choose WD120EFBX for a quieter, cooler always-on NAS: 196MB/s, 256MB cache, 2.9W idle and 20dBA idle versus 6.1W and 34dBA for EFGX. Both are 12TB CMR, 7,200 RPM Red Plus drives with the same workload and warranty class. The better model depends on whether speed or acoustics and energy matter more.
WD Red Plus WD120EFGX
Performance-first 12TB Red Plus buyers who can accept higher noise and power in exchange for the strongest cited transfer rate and cache.
WD Red Plus WD120EFBX
Noise- and power-conscious 12TB NAS builds where a quieter helium model matters more than the maximum sequential transfer rating.
Verified specifications
WD120EFGX and WD120EFBX specifications
| Specification | WD Red Plus WD120EFGX | WD Red Plus WD120EFBX |
|---|---|---|
| Capacity | 12TB | 12TB |
| Recording technology | CMR | CMR |
| Drive design | Air | Helium |
| Interface | SATA 6Gb/s | SATA 6Gb/s |
| RPM | 7,200 | 7,200 |
| Internal transfer rate, up to | 260MB/s | 196MB/s |
| Cache | 512MB | 256MB |
| Read/write power | 8.8W | 6.3W |
| Idle power | 6.1W | 2.9W |
| Idle acoustics | 34dBA | 20dBA |
| Seek acoustics | 39dBA | 29dBA |
| Weight | 0.75kg | 0.66kg |
| Workload rating | 180TB/year | 180TB/year |
| Warranty | 3 years | 3 years |
Specifications apply to the exact cited models or current family data sheets. Retail stock can include older revisions, regional suffixes and seller-created titles.
Current offers
Compare current offers for the models in this guide
Retail listings can combine capacities, revisions and conditions. Confirm the exact model number, seller, warranty region and final checkout price.
Interactive decision tool
12TB power-cost comparison
Estimate the drive-only electricity difference between the air-filled WD120EFGX and helium-filled WD120EFBX across an always-on array.
These are two very different 12TB designs
WD120EFGX and WD120EFBX share the Red Plus name, 12TB capacity, CMR recording, 7,200 RPM speed, 180TB-per-year workload rating and three-year warranty. The internal designs and operating profiles are nevertheless far apart. EFGX is air-filled, rated up to 260MB/s and equipped with 512MB cache. EFBX is helium-filled, rated up to 196MB/s and equipped with 256MB cache.
The performance advantage of EFGX is clear in the manufacturer specification. The efficiency and acoustic advantage of EFBX is equally clear. EFBX is listed at 2.9W idle and 20dBA idle; EFGX is listed at 6.1W and 34dBA. The choice is therefore not “new versus old” or “good versus bad.” It is a deliberate trade between throughput and a quieter, lower-power mechanical platform.
Retail pages often hide this distinction because both variants sit under one WD Red Plus 12TB family selector. Verify the complete model number before purchase. An image of a Red Plus label does not identify which operating profile will arrive.
Choose WD120EFGX for performance-first arrays
The 260MB/s maximum internal transfer rating is substantially higher than the 196MB/s rating of EFBX. A single 1GbE client will not use that full difference, but a multi-drive array with 2.5GbE or 10GbE, multiple simultaneous users, local scrubs, backups or rebuilds can benefit from faster members.
The 512MB cache is another specification advantage, although cache should not be treated as a direct benchmark. It can help selected workloads, but sustained performance still depends on platter location, filesystem, RAID and request pattern. The stronger reason to buy EFGX is the complete performance profile, not cache alone.
EFGX is most appropriate in a rack, utility room or office where higher noise and heat are manageable. Ensure the chassis has good airflow because an eight-drive array of higher-power disks adds a meaningful thermal load.
Choose WD120EFBX for a quiet always-on NAS
EFBX is the more attractive model for a NAS near people. The cited 20dBA idle figure is dramatically lower than the 34dBA figure for EFGX, and seek noise is listed at 29dBA instead of 39dBA. Real chassis noise will differ, but a ten-to-fourteen-decibel specification gap is large enough to influence the buying decision.
The power profile reinforces that advantage. EFBX is listed at 6.3W read/write and 2.9W idle, compared with 8.8W and 6.1W for EFGX. In a four- or eight-drive array that runs continuously, the difference affects electricity cost, internal temperature and fan speed.
Helium is not a quality guarantee, but it helps reduce drag inside high-capacity drives and is associated here with the lower-power design. The trade-off is lower rated sequential transfer. For a home backup and media NAS limited by 1GbE, that lower rating may have little practical cost.
Network speed determines how much EFGX performance you can see
A 1GbE connection tops out far below the rated sequential speed of either model after overhead. If the NAS serves one computer over 1GbE, both drives can saturate the network during large-file reads under favorable conditions. The EFGX advantage appears more clearly when the system aggregates several disks, serves several clients or uses a faster network.
On 10GbE, the complete array matters. Four or more disks can contribute to throughput, but CPU, RAID implementation, filesystem, encryption and client storage can become bottlenecks. A faster drive model helps, yet it cannot guarantee a particular end-to-end result.
Do not select EFGX for a performance problem caused by Wi-Fi, 1GbE, an underpowered NAS CPU or small random files. Diagnose the actual bottleneck before accepting higher noise and power.
Calculate array electricity, not one-drive electricity
The annual power calculator uses the published active and idle figures to compare the two models across a selected drive count and electricity rate. It is an estimate because actual NAS behavior alternates among active, idle, standby and background maintenance states, while the power supply adds losses.
Even a rough calculation is useful. The 3.2W idle difference becomes 25.6W across eight drives. If the NAS spends much of the day idle, EFBX can save a meaningful amount over several years and reduce the heat that fans must remove. If the disks are continuously active, the read/write difference is smaller but still multiplied by the array size.
Purchase price can outweigh energy savings, so compare the expected ownership period. A heavily discounted EFGX may still be cheaper overall in a short deployment, while EFBX can be better for a long-lived home NAS in an expensive electricity market.
Noise planning matters more at 12TB
High-capacity drives can produce low-frequency vibration that travels through desks and cabinets. Published acoustics are measured under controlled conditions and do not capture every resonance. Multiple drives seeking together can sound much louder than one unit on a test bench.
For a living-space NAS, EFBX is the clear specification choice, but the enclosure still needs damping and airflow. Place the NAS on a stable surface, tighten trays correctly and avoid enclosed furniture that traps heat. Do not wrap or pad the chassis in ways that block ventilation.
For a rack or server room, noise may be irrelevant. In that environment EFGX can deliver better rebuild and sequential performance, provided cooling and energy use are acceptable.
Both models remain standard Red Plus, not Red Pro
The faster EFGX does not move into the Red Pro workload or warranty class. Both 12TB models remain rated for up to eight-bay NAS systems, 180TB per year, one million hours MTBF and a three-year limited warranty. Buyers needing more than eight bays, a five-year warranty or 550TB-per-year workload should compare Red Pro rather than assuming EFGX is a substitute.
Conversely, a moderate home NAS does not need Red Pro merely because EFBX is quieter. EFBX provides a strong standard-tier capacity with CMR and a low-power helium design. The right tier is determined by bay count, workload, capacity and support requirements.
MTBF is a statistical population measure under defined conditions. It does not predict how long one EFGX or EFBX will run. Maintain backups and monitor every drive regardless of the selected model.
Final recommendation and checkout checks
Choose WD120EFGX for video workflows, faster networks, multi-user arrays and shorter rebuild priorities where the NAS is isolated from people. Choose WD120EFBX for home offices, living spaces, backup appliances and systems where low idle power and acoustics matter.
Compare current prices across the full drive count. Confirm exact model, condition, seller and warranty region. Check the NAS compatibility list and make sure the enclosure supports 12TB drives. Do not rely on a product-family image or combined review page.
Both models are valid CMR NAS choices. The mistake is buying one while expecting the operating profile of the other. Use the model number as the decisive identifier.
Official specifications used
Manufacturer specifications can change by exact model and region. These sources were used for the factual comparison.
Frequently asked questions
Which 12TB Red Plus model is faster?
WD120EFGX is rated up to 260MB/s, compared with 196MB/s for WD120EFBX.
Which model is quieter?
WD120EFBX has much lower cited acoustics: 20dBA idle and 29dBA seek versus 34dBA and 39dBA for WD120EFGX.
Are both drives 7,200 RPM and CMR?
Yes. Western Digital lists both as 7,200 RPM CMR Red Plus drives.
Which model uses less power?
WD120EFBX. It is listed at 6.3W read/write and 2.9W idle, compared with 8.8W and 6.1W for WD120EFGX.
Is WD120EFGX a Red Pro drive?
No. It is a standard Red Plus model with the standard 180TB/year workload and three-year warranty class.
Which is better for Plex?
Either can serve Plex media. EFBX is attractive for a quiet home server, while EFGX is better when the array also handles heavy multi-user transfers or faster networking.
Methodology and disclosure
Cloudzat separates standard, Pro, capacity and exact-model results; excludes obvious accessories and SSDs; and does not apply one revision’s RPM, noise or power specification to an entire family. Price data comes from the existing Cloudzat catalogue when a compatible source is available.
As an Amazon Associate, Cloudzat may earn from qualifying purchases. Affiliate links use sponsored and nofollow attributes. The commission does not change the buyer’s price.