Working in close collaboration with our hardware partner, Western Digital, we ensure that all innovations of hard drives are considered for maximum performance with our security systems.
Established since 1970, Western Digital is now one of the most dynamic data storage developers, creating high-performance hard-disk drives which record, store, and recall volumes of data across the globe.
( + ) WD Purple Specifications
Specifications |
4TB |
3TB |
2TB |
1TB |
| Model number | WD40PURX | WD30PURX | WD20PURX | WD10PURX |
| Formatted capacity1 | 4TB | 3TB | 2TB | 1TB |
| User sectors per drive | 7,814,037,168 | 5,860,533,168 | 3,907,029,168 | 1,953,525,168 |
| Form factor | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch |
| Advanced Format (AF) | Yes | Yes | Yes | Yes |
| RoHS compliant2 | Yes | Yes | Yes | Yes |
Performance |
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| Data transfer rate Buffer to host Host to/from drive (sustained) |
(max) 6 Gb/s 150 MB/s |
(max) 6 Gb/s 150 MB/s |
(max) 6 Gb/s 150 MB/s |
(max) 6 Gb/s 150 MB/s |
| Cache (MB) | 64 | 64 | 64 | 64 |
| Rotational speed (RPM) | IntelliPower | IntelliPower | IntelliPower | IntelliPower |
Reliability/Data Integrity
|
||||
| Load/unload cycles3 | 300,000 | 300,000 | 300,000 | 300,000 |
| Non-recoverable read errors per bits read | <10 in 1014 | <10 in 1014 | <10 in 1014 | <10 in 1014 |
| Limited warranty (years)4 | 3 | 3 | 3 | 3 |
Power Management
|
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| Average power requirements Read/Write Idle Standby and Sleep |
(W) 5.1 4.5 0.5 |
(W) 4.4 4.1 0.6 |
(W) 4.4 4.1 0.6 |
(W) 3.3 2.9 0.7 |
Environmental Specifications5
|
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| Temperature (on the base casting) Operating Non-operating |
(°C) 0 to 65 -40 to 70 |
(°C) 0 to 65 -40 to 70 |
(°C) 0 to 65 -40 to 70 |
(°C) 0 to 65 -40 to 70 |
| Shock Operating (2 ms, read/write) Operating (2 ms, read) Non-operating (2 ms) |
(Gs) 30 65 250 |
(Gs) 30 65 250 |
(Gs) 30 65 250 |
(Gs) 30 65 350 |
| Acoustics6 Idle Seek (average) |
(dBA) 25 26 |
(dBA) 23 24 |
(dBA) 23 24 |
(dBA) 21 22 |
| Physical Dimensions |
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| Height (in./mm, max) | 1.028/26.1 | 1.028/26.1 | 1.028/26.1 | 1.028/26.1 |
| Length (in./mm, max) | 5.787/147 | 5.787/147 | 5.787/147 | 5.787/147 |
| Width (in./mm, ± .01 in.) | 4/101.6 | 4/101.6 | 4/101.6 | 4/101.6 |
| Weight (lb./kg, ± 10%) | 1.50/0.68 | 1.40/0.64 | 1.40/0.64 | 0.99/0.45 |
( + ) Attributes Comparison: WD Xe, Re, and Red
 WD Xe |
 WD Re |
 WD Red |
|
| Class | Performance-Optimized | Capacity-Optimized | 1-5 bay NAS |
| Form Factor | 2.5″ 3.5″ |
3.5″ | 3.5″ |
| Interface / Capacity | SAS 6 GBb/s – 300 GB, 450 GB, 600 GB, 900 GB |
SATA 3 Gb/s – 250 GB, 500 GB, 1 TB, 2 TB SATA 6 Gb/s – 2 TB, 3 TB, 4 TB SAS 6 Gb/s – 1 TB, 2 TB, 3 TB, 4 TB |
SATA 6 Gb/s – 1 TB, 2 TB, 3 TB |
| Reliability (Duty Cycle) | 2.0M hours MTBF (100%) | 1.4/1.2M hours MTBF (100%) | 1M hours MTBF (25%) |
| Non-recoverable Error Rate | <1 in 1016 | <1 in 1016 | <1 in 1014 |
| Workload | 550 TB/year | 550 TB/year | N/A* |
| Power-On Hours | 8760 (24×7) | 8760 (24×7) | 8760 (24×7) |
| Warranty | 5 year | 5 year | 3 year |
| Performance / Power Features | 10,000 | 7,200 | IntelliPowerTM |
| AID Features | TLER | TLER | TLER |
| Multi-Drive Features | StableTracTM RAFF | StableTracTM RAFF | – |
| Firmware | Enterprise-class Firmware | Enterprise-class Firmware | – |
| Manufacturing & Test Process | Functional Integrity Testing (FIT) Dedicated enterprise-class manufacturing Enterprise Systems Group (ESG) system/Workload testing | Functional Integrity Testing (FIT) Dedicated enterprise-class manufacturing Enterprise Systems Group (ESG) system/Workload testing | Functional Integrity Testing (FIT) |
*Not specified; able to handle a typical workload of a 1-5 bay NAS system
( + ) AV Drives vs Desktop Drives
| AV CE (PVR) Profile |
PC Desktop (PC) Profile |
|
| Power Cycle | 24 hours / 7 days | 4 – 10 hours per day |
| Writes/Read per day | Typical = > v300 GB write / 150 GB read | 1 GB write / 2 GB read |
| Transfer Type | Random / ping pong across whole disk | Random with very narrow seek (<3GB) |
| Transfer length per command | 5% = 1 to 20 blocks 95% = 256 to 1500 blocks |
80% = 1 to 256 blocks 20% = 240 to 256 blocks |
| Read/Write ratio | Read 20% & Write 80% | Reads 64% & Write 36% |
| Error time limit | Less than 250 – 1000ms | 30,000ms |
| Case Temperature | 25° – 70°C | 25° – 45°C |
| Warranty | 3 years | 2 years |
| AFR | < 0.5% at 25° – 70°C | < 0.5% at 25° – 45°C |
