WD Purple 4 TB: price per TB and price history
Part number WD42PURZASIN B09MSDP2DTBrand Western DigitalInternal 3.5"
The WD Purple 4 TB (WD42PURZ) is an internal 3.5-inch hard drive by Western Digital with CMR recording. On amazon.com it costs $232.00 new, which is $58.00 per TB (as of Oct 28, 2026, 1:02 AM UTC). The TB index for internal 3.5-inch hard drives is $36.25 per TB.
Price per TB, New
Total $232.00 for 4 TB, cheapest new offer, excl. shipping
- 1 day
- 0.0 %
- 7 days
- ▼ 0.4 %
- 30 days
- ▼ 0.4 %
- 90-day low
- 57.50
90 days
How much does the WD Purple 4 TB cost per TB?
The WD Purple 4 TB costs $58.00 per TB new on amazon.com. That is 60.0% above the TB index for internal 3.5-inch hard drives ($36.25 per TB). Among 79 new internal 3.5-inch hard drives it ranks number 45 by price per TB.
| Condition | Price | Price per TB | As of | Offer |
|---|---|---|---|---|
| New | $232.00Oct 28, 2026, 1:02 AM UTC | $58.00 | Oct 28, 2026, 1:02 AM UTC | Amazon* |
Prices: cheapest offer per condition from all sellers on amazon.com (Amazon and marketplace sellers), excluding shipping, timestamp per row. At the top of its product page, Amazon often shows the featured offer from another seller, which can cost more. The button therefore opens the list of all offers. The price may have changed since the timestamp. If the Amazon app opens in another country's store, prices there differ: set the app to United States or open the link in your browser.
How has the price of the WD Purple 4 TB changed?
Over the last 30 days the price fell by 0.4%, from $232.90 to $232.00. The 90-day low is $57.50 per TB ($230.00). It counts the lowest price that held for at least 2 days.
| Period | Change in price per TB |
|---|---|
| 7 days | ▼ 0.4 % |
| 14 days | ▼ 0.4 % |
| 30 days | ▼ 0.4 % |
| 90 days | ▼ 0.4 % |
Price archive since Jul 30, 2026, updated daily.
What are the specs of the WD Purple 4 TB?
According to the Western Digital data sheet, the WD Purple 4 TB has CMR (conventional magnetic recording) and 256 MB cache. CMR suits RAID arrays and continuous operation.
| Spec | Value |
|---|---|
| Brand | Western Digital |
| Series | WD Purple |
| Part number | WD42PURZ |
| ASIN | B09MSDP2DT |
| Capacity | 4 TB (4 × 10¹² Byte) |
| Form factor | 3.5" internal |
| Technology | HDD |
| Recording | CMR |
| Cache | 256 MB |
Source: Western Digital data sheet
What are the alternatives to the WD Purple 4 TB?
In the same series, the WD Purple 4 TB (WD44PURZ-SPCPDY0) is cheaper at $48.75 per TB. At 4 TB, the White Label WL 4 TB (WL4000GSA6472E) costs $42.49 per TB.
| Product | Capacity | Price per TB | Recording |
|---|---|---|---|
| WD Purple 1 TB | 1 TB | $152.00 | CMR |
| WD Purple 2 TB | 2 TB | $87.37 | |
| WD Purple 3 TB | 3 TB | $69.67 | CMR |
| WD Purple 4 TB | 4 TB | $48.75 | CMR |
| WD Purple 6 TB | 6 TB | $54.42 | CMR |
| WD Purple 8 TB | 8 TB | $54.25 | CMR |
| WD Purple 12 TB | 12 TB | $59.97 | CMR |
| Product | Capacity | Price per TB | Recording |
|---|---|---|---|
| White Label WL 4 TB | 4 TB | $42.49 | |
| Mdd Maxdigitaldata 7200PM CCTV DVR 4 TB | 4 TB | $42.50 | |
| WD Blue PC 4 TB | 4 TB | $45.00 | CMR |
| Seagate IronWolf 4 TB | 4 TB | $47.50 | |
| WD Red Plus NAS 4 TB | 4 TB | $47.50 | CMR |
Frequently asked questions about the WD Purple 4 TB
Is the WD Purple 4 TB cheap right now?
The price per TB is 0.9% above the 90-day low of $57.50 and 60.0% above the TB index for its product type (as of Oct 28, 2026, 1:02 AM UTC).
Is the WD Purple 4 TB CMR or SMR?
CMR, according to the Western Digital data sheet.
Related guides: Best NAS hard drive, CMR vs SMR, SSD vs HDD, Refurbished hard drives, Hard drive prices, Black Friday SSD and hard drive deals, Surveillance hard drive, RAID levels explained, Check hard drive health, How to partition a hard drive
Prices: amazon.com, timestamp per row. Specs: manufacturer data sheet. Calculation: How the TB index works. All offers Internal 3.5".