Type: HDD
Interface: SATA
Form Factor: 3.5 inch
Capacity: 4 TB
Desktop
Services 3 Year Included Limited Warranty
In The Box Sales Package WD 4 TB Red NAS Internal HD and Warranty Document
Brand WD
Model ID WD40EFRX
OS Compatibility Windows, Mac, Linux
Drive Configuration 
Device Desktop
Device Type 3.5 inch HDD
Drive Capacity 4 TB
Interface SATA
Cache Memory 64 MB
Data Transfer Rate (To/From Host) 6144 Mbps
Reliability 1000000 hours (Mean Time between Failures)
Form Factor 3.5 inch
Power
Standard Input Voltage 12 V, 5 V DC
Idle 3.3 W
Power Consumption 4.5 W (Read/Write), 0.4 W (Standby/Sleep)
Operating Conditions
Operating Temperature DegC to 70DegC
Non-Operating Temperature -40DegC to 70DegC
Operating Humidity 5 % to 95 %
Shock Tolerance Read: 65 G for 2 ms (Operating), 250 G for 2 ms (Non-Operating)
Other Features Rotational Speed: IntelliPower, User Sectors Per Drive: 7814037168, Acoustics - Idle Mode (Average): 25 dBA, Seek Mode (Average): 0 to 28 dBA, Vibration - Operating: 0.004 g/Hz (10 to 300 Hz), Non-operating: 0.05 g/Hz (10 to 300 Hz), Operating Linear: 20 - 300 Hz, 0.75G (0 to Peak)
Dimensions 101.6 mm x 26.1 mm x 147 mm
Weight 680 g
Warranty
Warranty Summary 3 Year Included Limited Warranty