2TB WD Purple Surveillance Storage HDD

WD Red WD40EFRX - harddisk 4 TB SATA 6Gb/s HDD

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2TB WD Purple Surveillance Storage HDD

WD20PURX

The smart choice for surveillance

WD Purple Surveillance Storage offers exclusive AllFrame technology to bring you premium reliability and peace-of-mind when installing your home or small to medium business security system. WD Purple’s exclusive firmware upgrades work with ATA streaming to reduce error pixilation and video interruptions that occur when desktop hard drives are incorrectly used as storage in security systems. WD Purple Surveillance Storage is built for 24/7, always-on, high-definition surveillance security systems that use up to eight hard drives and up to 32 cameras.
Choose a drive that is designed and engineered for home and business surveillance systems and enjoy the peace-of-mind you can only get from a surveillance-class hard drive.

Specifications	4 TB	3 TB	2 TB	1 TB
Model number1	WD40PURX	WD30PURX	WD20PURX	WD10PURX
Formatted capacity2	4 TB	3 TB	2 TB	1 TB
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 compliant3	Yes	Yes	Yes	Yes
Performance
Data transfer rate (max) Buffer to host Host to/from drive (sustained)	6 Gb/s 150 MB/s	6 Gb/s 145 MB/s	6 Gb/s 145 MB/s	6 Gb/s 110 MB/s
Cache (MB)	64	64	64	64
Rotational speed (RPM)	IntelliPower	IntelliPower	IntelliPower	IntelliPower
Reliability/Data Integrity
Load/unload cycles4	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)5	3	3	3	3
Power Management
Average power requirements (W) Read/Write Idle Standby and Sleep	5.1 4.5 0.5	4.4 4.1 0.6	4.4 4.1 0.6	3.3 2.9 0.7
Environmental Specifications6
Temperature (°C, on the base casting) Operating Non-operating	0 to 65 -40 to 70	0 to 65 -40 to 70	0 to 65 -40 to 70	0 to 65 -40 to 70
Shock (Gs) Operating (2 ms, read/write) Operating (2 ms, read) Non-operating (2 ms)	30 65 250	30 65 250	30 65 250	30 65 350
Acoustics (dBA)7 Idle Seek (average)	25 26	23 24	23 24	21 22
Physical Dimensions
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