Western Digital · NAS hard drive buying guide
Western Digital WD Red Pro 22TB (WD221KFGX) Buying Guide
Product facts and dated cost
Western Digital WD Red Pro 22TB · Exact identity: WD221KFGX
22TB decimal capacity · CMR · SATA 6 Gb/s
Catalog amount: $969.99 · unverified · Price record: 2026-08-31. Tax and shipping excluded.
Latest prices could not be retrieved. Showing a dated backup; recheck the store.
WD Red Pro 22TB: specifications and dated store comparison →22TB decimal CMR Red Pro, exact WD221KFGX, helium 7200 rpm class.
One 22TB 3.5-inch SATA HDD, CMR / Helium, OptiNAND Yes, 512 MB cache, 7200 rpm. Enclosure sold separately.
This guide is for the exact WD221KFGX. Official ratings come from a reread of the January 2025 WD Red Pro data sheet column plus the current US product page. 2 original test group(s) apply to this exact MPN. Results stay bound to the stated host, protocol and file size. ChooseCompute has not tested this drive. Listing prices below keep their original observation dates. See the review evidence ↓
Is 22TB WD Red Pro storage right for your NAS?
A 22TB-per-bay capacity plan
One drive provides 22TB decimal before formatting; redundancy, snapshots and backup still consume headroom.[1][9]
Multi-bay commercial NAS
Current official pages claim RAID-optimized NAS at any / unlimited bay count. That is not a host HCL entry and does not override branded-drive policies.[1][9]
Quiet storage beside a desk
Published idle/seek is 20 / 32 dBA. Installed resonance is still enclosure-specific.[1]
WD221KFGX exact specifications
Full specifications ↗Follow any specification for its full conditions and sources.
Living with it
Capacity, power, cooling and sound for WD221KFGX
Official column vs the product-page chip
The January 2025 table for WD221KFGX: CMR / Helium, OptiNAND Yes, 265 MB/s, 20 / 32 dBA, 6.8W / 3.4W, 0 to 65°C, 2,500,000 hours, 550 TB/year, 5-year limited warranty, origin TH. US product pages currently say unlimited / any bay count and mention NASware plus TLER. Marketing copy that mentions OptiNAND only on 22/24/26TB does not override the 20TB Yes cell.[1][9]
What exact-model tests found for WD221KFGX
Our buying advice combines official specifications with the original reviews below. We have not tested this product ourselves. Expand a review for its setup, measurements and limitations.
StorageReview
Lyle SmithFeb 2, 2023
WD Red Pro 22TB review
Exact WD221KFGX in an 8-drive RAID6 on QNAP TVS-h1288x. Sequential large-block array throughput exceeded 2 GB/s on SMB and iSCSI; 4K writes beat the WD Gold 22TB set in the same chassis. These figures are array-plus-NAS-protocol results, not a single-disk CrystalDiskMark run.
Read the original reviewTest setup, measurements & limitations
WD Red Pro 22TB review
Tested: Eight WD221KFGX drives in RAID 6 inside a QNAP TVS-h1288x, tested over SMB and iSCSI with 4K, 8K and 128K enterprise synthetic profiles. Preconditioned to steady state at16 threads and16 outstanding requests per thread; mixed workload swept2T/2Q through16T/16Q.
Applies to: Eight-drive array evidence; all throughput and IOPS are system-level, not one-drive results.
- Exact WD221KFGX in an 8-drive RAID6 on QNAP TVS-h1288x. Sequential large-block array throughput exceeded 2 GB/s on SMB and iSCSI; 4K writes beat the WD Gold 22TB set in the same chassis.Source location: Performance and Conclusion
- These figures are array-plus-NAS-protocol results, not a single-disk CrystalDiskMark run.Source location: Enterprise Synthetic Workload Analysis setup
| Measurement | Result | Conditions & source location |
|---|---|---|
| 8-drive RAID6 4K throughput (SMB) | 5,807 IOPS read / 1,490 IOPS write | QNAP TVS-h1288x, eight of 12 bays, RAID6, SMBEnterprise Synthetic Workload Analysis, 4K throughput chart |
| 8-drive RAID6 128K sequential (SMB) | 2.31 GB/s read / 2.28 GB/s write | Same RAID6 array; array-level, not a single-disk 265 MB/s proof128K benchmark paragraph and chart |
| 8-drive RAID6 128K sequential (iSCSI) | 2.27 GB/s read / 2.31 GB/s write | Same array, iSCSI128K benchmark paragraph |
| 8-drive RAID6 4K throughput (iSCSI) | 5,911 IOPS read / 1,498 IOPS write | Same preconditioned QNAP array;100%4K read/write profiles.4K throughput paragraph |
| 8-drive RAID6 8K sequential throughput | SMB130,181/69,904 IOPS; iSCSI190,762/214,899 IOPS read/write | 100%8K sequential profiles; array results, not single-disk speed.8K sequential paragraph |
| 8-drive RAID6 8K70/30 mixed throughput | SMB770→1,972 IOPS; iSCSI643→1,944 IOPS | 2T/2Q→16T/16Q;70%read/30%write.8K70/30 throughput paragraph |
Limits to keep in mind
- Eight-drive RAID6 on a specific QNAP hides per-disk speed.
- Article specification table still shows the older 300 TB/year / 1e6-hour brief.
- One lab population, not a field failure study.
- Affiliate link present; gift/loan status unknown. Latency prose contains duplicated comparator values; no additional latency figures adopted without chart verification.
KitGuru
Simon CrispAug 31, 2022
WD Red Pro 22TB HDD Review
Page 7 prose says peak read at 8 MB and peak write at 512 KB. The original Average Throughput graph (block-size sweep 1 KB–16 MB) shows the opposite pattern: blue Read peaks around 512 KB, orange Write peaks around 8 MB. Preserve the inconsistency; do not treat the prose peak-block claims as graph-confirmed. The graph is a block-size sweep, not a full-disk LBA/inner-track or elapsed-time slowdown. Final plotted points at 16 MB are read 205.06 MB/s and write 252.94 MB/s.
Read the original reviewTest setup, measurements & limitations
WD Red Pro 22TB HDD Review
Tested: Label photo WD221KFGX-68B9KN0, S/N 2TG1HXAE, 25 JUL 2022, Thailand, NASware 3.0. Page 3 rig: AMD Ryzen 5 3600X, 16GB DDR4-2400, MSI MPG X570 Gaming Edge Wifi; HDDerase V4 wipe; each test run five times. IOMeter screenshot is 4 KiB, 100% random, 100% read; queue depth and test span are not visible on that dialog.
Applies to: Exact-MPN single-drive desktop lab. Not a NAS array. Article still quotes the older 300 TB/year brief.
- Page 7 prose says peak read at 8 MB and peak write at 512 KB. The original Average Throughput graph (block-size sweep 1 KB–16 MB) shows the opposite pattern: blue Read peaks around 512 KB, orange Write peaks around 8 MB. Preserve the inconsistency; do not treat the prose peak-block claims as graph-confirmed.Source location: Page 7 prose vs WD-Red-Pro-22TB-Throughput.png
- The graph is a block-size sweep, not a full-disk LBA/inner-track or elapsed-time slowdown. Final plotted points at 16 MB are read 205.06 MB/s and write 252.94 MB/s.Source location: Throughput chart axis labels and end annotations
- ATTO text 259/258 MB/s. PCMark 10 Data Drive: 3 traces × 3 passes, 339 JPEGs / 2.37 GB, overall 64 MB/s. FastCopy: seven large-file writes average 245.28 MB/s; 5 GB image 277 MB/s write; AutoCAD folder 278 MB/s read; 50 GB small-file folder 165 MB/s write / 134 MB/s read.Source location: Pages 5, 8, 9 (parent-reading.json confirmed text)
| Measurement | Result | Conditions & source location |
|---|---|---|
| Throughput graph at 16 MB block | 205.06 MB/s read / 252.94 MB/s write | Average Throughput by block size; last x-axis tick 16 MBWD-Red-Pro-22TB-Throughput.png |
| ATTO sequential (article text) | 259 MB/s read / 258 MB/s write | Page 5; official 265 MB/s not reached in that runPage 5 ATTO |
| PCMark 10 Data Drive | 64 MB/s overall | 3 JPEG-copy traces, 3 passes, 339 files / 2.37 GBPage 8 |
| IOMeter access spec (screenshot) | 4 KiB, 100% random, 100% read | QD and test span unknown; page 6 quotes 722 IOPS read / 810 IOPS write separatelyIometer4KSetup.png and page 6 |
Limits to keep in mind
- Page 7 prose peak-block sizes contradict the original graph; graph wins for block-size association.
- Desktop path, not a multi-bay NAS rebuild.
- 2022 article 300 TB/year vs January 2025 550 TB/year column.
- Queue depth / duration for IOMeter not shown on the saved dialog.
Before you buy
Current and historical WD221KFGX listings and ownership costs
2 dated current main offer(s) from 2026-09-10 kept
Displayed Newegg card keeps checkedAt 2026-09-10 and $969.99. A 2026-09-11 reread of the same URL used the primary sold-by pane: Sold by Newegg, new, in stock, ShippingCharge 0.01. Popover other-sellers (Adorama/BeachAudio/etc.) were not selected. Unknown-seller Newegg row ['merchant-newegg-4-new'] archived.[7][8]
Compare stores for this exact model
One 22TB 3.5-inch SATA HDD, CMR / Helium, OptiNAND Yes, 512 MB cache, 7200 rpm. Enclosure sold separately. Check the total delivered price at the store.
Current price needs checking
Check stores below
5 stores · 0 recent price observations
Newegg
Sold by Adorama
$969.99
Historical price
Stock not confirmed · New
One 22TB 3.5-inch SATA HDD
Observed shipping: $0.00
Observed Oct 6, 2026, 1:28:25 AM UTC[14]
View exact product at NeweggB&H
Seller not recorded
$999.99
Historical price
Currency not confirmed
Stock not confirmed · Condition not recorded
Observed Sep 27, 2026, 5:54:32 AM UTC[11]
View exact product at B&HBest Buy
Sold by Newegg Official
$1,028.49
Historical price
Currency not confirmed
Stock not confirmed · Condition not recorded
Observed Sep 27, 2026, 2:01:16 PM UTC[12]
View exact product at Best BuyWestern Digital
Seller not recorded
$1,179.99
Historical price
Currency not confirmed
Stock not confirmed · Condition not recorded
Observed Sep 26, 2026, 4:07:43 PM UTC[13]
View exact product at Western DigitalAmazon
Sold by Adorama
Check price
Stock not confirmed · New
One 22TB 3.5-inch SATA HDD
Shipping cost, US destination eligibility, import status and tax require checkout verification. Current page observation only. Recheck exact MPN/variant, seller, stock, hidden or changed price, regional warranty, shipping and tax before ordering.
Observed Sep 10, 2026[7]
View exact product at AmazonPrices are dated observations. Confirm the model, seller, condition, stock and delivered total at the store. Older prices remain visible as history. Links may earn a commission.
WD221KFGX questions before buying
Is WD221KFGX the same as every WD Red Pro 22TB?
No. This page is only WD221KFGX. Other capacities and retired suffixes are separate products.[1][9]
Will one WD221KFGX deliver 265 MB/s?
265 MB/s is the official internal transfer rating for this column (footnote: up to stated read speed; host, capacity and workload change results). NAS copies are usually limited by RAID, clients and Ethernet.[1]
Does unlimited bays mean any NAS will accept it?
No. It is Western Digital's current family compatibility claim. Confirm the NAS vendor list, DSM/QTS policy, bay firmware and warranty rules for the exact enclosure.[1][9]
Do MTBF, 550 TB/year or five years tell me this unit will last?
No. Footnote 5–7 on the data sheet treat MTBF as a population statistic, workload as a temperature-dependent rating, and warranty as regional support—not a field failure rate.[1]
Sources
Research updated Sep 11, 2026. Individual source check dates are listed below. Measurements belong to the named reviewers; tested configurations and software versions may differ from the product you buy.
- [1] Western Digital WD Red Pro data sheet — January 2025 ↗
Checked Sep 11, 2026 · January 2025 family PDF, WD221KFGX column plus footnotes 1–8; highlights 'unlimited # of bays'
- [2] WD Red Pro 22TB review ↗
Checked Sep 10, 2026 · Exact-MPN original test; configuration, findings, measurements and limitations preserved in the matching review record.
- [3] B&H: WD221KFGX historical US listing ↗
Checked Aug 30, 2026 · Catalog record dated 2026-08-30: exact MPN, new condition, seller status retailer, availability in-stock. Historical catalog reference price $999.99. Any usable 2026-09-10 main offer is recorded separately rather than overwriting this historical observation.
- [4] Amazon: WD221KFGX historical US listing ↗
Checked Aug 31, 2026 · Catalog record dated 2026-08-31: exact MPN, new condition, seller status marketplace-unverified, availability listed. No historical price adopted for this URL. Any usable 2026-09-10 main offer is recorded separately rather than overwriting this historical observation.
- [5] Best Buy: WD221KFGX historical US listing ↗
Checked Aug 31, 2026 · Catalog record dated 2026-08-31: exact MPN, new condition, seller status marketplace-unverified, availability listed. No historical price adopted for this URL. Any usable 2026-09-10 main offer is recorded separately rather than overwriting this historical observation.
- [6] Western Digital: WD221KFGX historical US listing ↗
Checked Aug 31, 2026 · Catalog record dated 2026-08-31: exact MPN, new condition, seller status manufacturer, availability listed. No historical price adopted for this URL. Any usable 2026-09-10 main offer is recorded separately rather than overwriting this historical observation.
- [7] Amazon: WD221KFGX current US new listing ↗
Checked Sep 10, 2026 · Exact MPN in title; selected new main buy box provides Add to cart and shows seller Adorama; numeric price is hidden behind cart.
- [8] Newegg: WD221KFGX current US new listing ↗
Checked Sep 10, 2026 · Exact MPN in H1; selected main offer shows Add to cart, seller Newegg, and a visible price of $969.99.
- [9] WD Red Pro NAS Hard Drive — 22TB US product page ↗
Checked Sep 11, 2026 · Key features, Specifications (Capacity/Model Number/Transfer Rate/Compatibility), FAQ comparing Red Pro vs Red Plus
- [10] WD Red Pro 22TB HDD Review (KitGuru) ↗
Checked Sep 11, 2026 · Pages 1, 4–10: identity WD221KFGX, CrystalDiskMark, ATTO, IOMeter, throughput, PCMark, FastCopy, closing
- [11] B&H product price observation ↗
Checked Sep 27, 2026 · Captured observation; sha256:60c8be41ecf3dae5bb85d17e7de37915a423627ddd6a80940f5304af02772841
- [12] Best Buy product price observation ↗
Checked Sep 27, 2026 · Captured observation; sha256:3a97a39228cb074fabd879e07f9f2e19ae99b306869609c55b9898aed66cbaee
- [13] Western Digital product price observation ↗
Checked Sep 26, 2026 · Captured observation; sha256:80de230cbbd8c5e86d7fc38e04f183ea31c4426bc9ba96cb5d83b53db8c9f1bf
- [14] Newegg product price observation ↗
Checked Oct 6, 2026 · newegg-main-item; sha256:5b9b2c97a95f26a8acf2a896ae67f6609759cc825e1947effe50d3344130ec69
Research and review record
- Research: Grok 4.6 · Source research and data update
- Self-check: Grok 4.6 · Researcher self-check
- Independent review: GPT-6 (Codex) · Exact official column/footnotes, StorageReview8-drive-array workload methods and KitGuru original single-drive evidence, primary seller and dated retained offers.
- Editorial integration: GPT-6 (Codex) · Editorial integration and validation
Independent review completed for the scope recorded in the audit.
Source evidence and review history (JSON)