WD Purple 3TB Surveillance Internal Hard Drive WD33PURZ 3.5-inch SATA 6Gb/s 256MB Cache CMR
Brand:
Western Digital
WD Purple 3TB Surveillance Internal Hard Drive WD33PURZ 3.5-inch SATA 6Gb/s 256MB Cache CMR
€405 inc. VAT
WD33PURZ
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WD Purple 3TB Surveillance Hard Drive
3TB CMRSATA 6 Gb/s256 MB cache180 TB/yearUp to 64 HD cameras
The WD Purple 3TB (part number WD33PURZ) is a 3.5-inch CMR surveillance hard drive with a 256 MB cache and sustained transfers of up to 180 MB/s over SATA 6 Gb/s. It is designed to sit inside a DVR or NVR and write video continuously, and Western Digital rates the line for up to 64 single-stream HD camera channels at a workload of 180 TB per year. Typically in stock with fast delivery across Cyprus.
Before you buy: this is a bare 3.5-inch internal drive with no screws, SATA cable or caddy in the box. It is tuned for sequential video writes rather than for use as a boot disk or a general purpose NAS drive. Western Digital caps the 1TB to 3TB WD Purple models at enclosures of up to 8 drive bays; the 4TB and larger models are rated for up to 16. Confirm that your recorder supports a drive of 3TB, since many surveillance appliances have a firmware limit on maximum capacity.
Best For
✓ DVR and NVR recorders
AllFrame firmware uses the ATA streaming command set to keep writing frames in order instead of pausing to retry, which is what prevents dropped frames.
✓ 24x7 continuous recording
Rated for permanent operation at 180 TB per year, roughly three times a desktop drive.
✓ Multi-camera systems
Western Digital rates the WD Purple line for up to 64 single-stream high-definition camera channels on one drive.
✓ Low-heat, low-noise installations
At 4.7 W read and write and 23 dBA idle, it is one of the cooler and quieter drives you can put in a recorder cabinet.
Key Features
AllFrame technology
Firmware tuned for the ATA streaming command set, which prioritises writing every frame in sequence over retrying reads the way a desktop drive would.
Up to 64 HD cameras
Western Digital rates the line for as many as 64 single-stream high-definition camera channels.
180 TB per year workload
Sized for permanent recording rather than the intermittent duty cycle a desktop drive assumes.
CMR, not SMR
Conventional magnetic recording keeps overwrite performance steady as the drive loops over old footage, which is exactly what a recorder does.
Sustained 180 MB/s
Maximum sequential transfer rate over SATA 6 Gb/s, the figure that matters for simultaneous multi-camera writes.
Low power draw
4.7 W during read and write, so a multi-drive recorder stays within its power budget.
Technical Specifications
| Drive | |
| Brand | Western Digital |
| Series | WD Purple |
| Part Number (MPN) | WD33PURZ |
| Form Factor | 3.5-inch internal |
| Capacity | 3TB |
| Interface | SATA 6 Gb/s |
| Rotational Speed | 5400 RPM class |
| Cache | 256 MB |
| Recording Technology | CMR (conventional magnetic recording) |
| Surveillance Capability | |
| Maximum HD Cameras | Up to 64 single-stream |
| Concurrent AI Streams | Not rated by Western Digital for the standard WD Purple line. AI stream ratings are published only for WD Purple Pro. |
| Firmware | AllFrame |
| Duty Cycle | 24x7 continuous recording |
| Recommended Bays | Up to 8 |
| Performance and Endurance | |
| Sustained Transfer Rate | Up to 180 MB/s |
| Workload Rating | Up to 180 TB per year |
| Load / Unload Cycles | 300,000 |
| MTBF | 1,000,000 hours |
| Power and Acoustics | |
| Power (Read / Write) | 4.7 W |
| Power (Idle) | 4.3 W |
| Power (Standby / Sleep) | 0.3 W |
| Acoustics (Idle) | 23 dBA |
| Acoustics (Seek) | 27 dBA |
| Physical and Warranty | |
| Dimensions | 26.1 x 147 x 101.6 mm |
| Weight | 0.57 kg (1.26 lb) |
| Operating Temperature | 0 to 65 degrees Celsius |
| Warranty | 1-Year Warranty (Singular) |
| Product Identifiers | |
| MPN | WD33PURZ |
| EAN / GTIN | 0718037897353 |
Frequently Asked Questions
Does the WD33PURZ work with Hikvision, Dahua and other NVR brands?
Yes. It is a standard 3.5-inch SATA 6 Gb/s drive and fits any recorder with a SATA bay. Check your recorder documentation for the maximum supported capacity, because some older NVR models cannot address a drive of 3TB.
Is the WD33PURZ suitable for a NAS or a desktop PC?
It will work, but it is optimised for sequential video writes rather than the mixed random workload of a NAS or an operating system disk. For a NAS choose WD Red Plus or WD Red Pro; for a desktop choose WD Blue or WD_BLACK.
What is the difference between WD Purple and WD Purple Pro?
Purple Pro spins at 7200 RPM, is rated to 550 TB per year and is the only one of the two that Western Digital rates for AI analytics streams. Standard WD Purple is rated to 180 TB per year, runs cooler and quieter, and is aimed at conventional recording without on-device analytics.
What do I need to know before buying the WD33PURZ?
It is a bare internal drive with no cables, screws or caddy included. Surveillance footage is not backed up by the recorder, so keep a separate copy of anything you must retain for evidence or compliance.
Singular Expert Insight
For a straightforward recorder without analytics, standard WD Purple is the right level: the AllFrame firmware is the part that actually matters, and it is present here just as it is on the Pro. Where the Pro earns its premium is AI workloads and heavy retention, since Western Digital only publishes an AI-stream rating for that line and triples the annual workload figure. If your NVR runs object or face detection, budget for Purple Pro instead. See our full range of surveillance hard drives or, for a general purpose NAS, our NAS hard drives.
Buyer's Guide
Buy this if
You run a DVR or NVR that records continuously and you want firmware built for video at a sensible price.
Skip if
Your recorder runs AI analytics, or you need a general purpose NAS or desktop drive. Purple Pro, Red Plus or WD Blue fit those better.
Also consider
WD Purple Pro for AI-enabled recorders, WD Red Plus for NAS enclosures, or a larger Purple if your retention period keeps growing.
Features - Western Digital - WD33PURZ
Form Factor
- 3.5",
- Internal
Interface
- SATA
More Details
Product Code
04:427484
EAN Code
0718037897353
Manufacturer
Western Digital
Technical specifications
Capacity
3TB