WD Red NAS 4Tb Internal Hard Disk Drive

6851 EGP

4TB Storage Capacity
3.5″ Form Factor
SATA III 6 Gb/s Interface
64MB Cache
5400 rpm
Up to 150 MB/s Sustained Transfer Rate
600,000 Load/Unload Cycles
1,000,000 Hours MTBF
Error Recovery Controls
NASware 3.0 Technology

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WD Red NAS 4Tb Internal Hard Disk Drive

Buffer	64 MB
Noise Level	28.0 dB (Active) 25.0 dB (Idle)

Reliability / Data Integrity

Endurance (Total Bytes Written)	180 TB
Load/Unload Cycles	600,000
Mean Time Between Failures (MTBF)	1.0 Million Hours
Non-Recoverable Read Errors per Bits Read	< 1 in 10¹⁴

Electrical

Power Draw	4.5 W (Active) 3.3 W (Idle) 0.4 W (Standby)
Supported Voltage	5 VDC, 12 VDC
Current	1.75 A at 12 VDC

Environmental

Operating Shock	30 G / 2.0 ms
Storage Shock	250 G / 2.0 ms
Operating Temperature	32 to 92°F / 0 to 60°C
Storage Temperature	-40 to 158°F / -40 to 70°C

General

Weight

1.5 lb / 0.7 kg

Packaging Info

Package Weight	1.465 lb
Box Dimensions (LxWxH)	7.5 x 5.05 x 2.55″

WD Red NAS 4Tb Internal Hard Disk Drive

HDD

MODEL	WD Red NAS
STORAGE TYPE	3.5 SATA
HDD CLASS	WD RED
Capacity	4TB
Disk Speed (RPM)	5400 RPM
Cache Size	64MB
Transfer Rate	up to 180MB/s
Part Number	WD40EFAX
Warranty	3 Years

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WD Red NAS 4Tb Internal Hard Disk Drive

WD Red NAS 4Tb Internal Hard Disk Drive

Buffer

Noise Level

Reliability / Data Integrity

Endurance (Total Bytes Written)

Load/Unload Cycles

Between Failures (MTBF)

Non-Recoverable Read Errors per Bits Read

Electrical

Power Draw

Supported Voltage

Current

Environmental

Shock

Storage Shock

Operating Temperature

Storage Temperature

General

Weight

Packaging Info

Package Weight

Box Dimensions (LxWxH)

WD Red NAS 4Tb Internal Hard Disk Drive

Reviews

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