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WD Red WD40EFRX 64MB 4TB vs. Seagate Barracuda ST4000DM004 256MB 4TB + 8
Noise level
23 - 27 dB
22 - 27 dB
23 - 24 dB
23 - 26 dB
26 - 28 dB
25 - 28 dB
20 - 29 dB
22 - 26 dB
27 - 28 dB
23 - 30 dB
Connection
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
Interface
S-ATA 6Gb/s
S-ATA 6Gb/s
S-ATA 6Gb/s
S-ATA 6Gb/s
S-ATA 6Gb/s
S-ATA 6Gb/s
S-ATA 6Gb/s
S-ATA 6Gb/s
S-ATA 6Gb/s
S-ATA 6Gb/s
Dimensions (WxHxD)
Depth
147 mm
146.99 mm
147 mm
146.99 mm
146.99 mm
147 mm
147 mm
100.35 mm
147 mm
146.99 mm
Height
26.1 mm
20.17 mm
26.1 mm
26.11 mm
20.2 mm
26.1 mm
26.1 mm
7 mm
26.1 mm
26.11 mm
Width
101.6 mm
101.6 mm
101.6 mm
101.85 mm
101.85 mm
101.6 mm
101.6 mm
69.85 mm
101.6 mm
101.6 mm
Form factor
3.5 inches
3.5 inches
3.5 inches
3.5 inches
3.5 inches
3.5 inches
3.5 inches
2.5 inches
3.5 inches
3.5 inches
Features
ERC (Error Recovery Control), NAS-optimized
ERC (Error Recovery Control), NAS-optimized
ERC (Error Recovery Control), NAS-optimized
ERC (Error Recovery Control), NAS-optimized
NAS-optimized
Cache size
64 MB
256 MB
64 MB
64 MB
256 MB
64 MB
512 MB
128 MB
64 MB
128 MB
Hybrid disk (SSHD)
No
No
No
No
No
No
No
Yes
No
No
Recording technology
CMR
SMR
CMR
CMR
SMR
CMR
CMR
CMR
SMR
Release year
2013
2017
2012
2016
2017
2014
2019
2016
2017
2014
Operational Power Consumption (min-max)
3.3 - 4.5 W
0.25 - 3.7 W
2.7 - 4.1 W
3.95 - 4.8 W
3.9 - 5.1 W
3.4 - 5.3 W
3 - 6.5 W
0.5 - 1.8 W
6.4 W
7.5 W
Power consumption (standby)
0.4 W
0.25 W
0.4 W
0.5 W
0.3 W
0.4 W
0.8 W
0.13 W
5.2 W
0.75 W
Advanced Format (AF)
512e
512e
512e
4Kn
512e
4Kn
512e
4Kn
Internal transfer rate
150 MB/s
190 MB/s
147 MB/s
263.38 MB/s
220 MB/s
175 MB/s
210 MB/s
140 MB/s
292 MB/s
Mean Time Between Failure (MTBF)
1000000 h
1000000 h
1000000 h
1000000 h
1000000 h
1000000 h
1000000 h
Number of disks (platters)
4
2
3
3
1
5
2
3
4
Rotational speed
5400 RPM
5400 RPM
5400 RPM
5900 RPM
7200 RPM
5400 RPM
5400 RPM
5400 RPM
7200 RPM
5900 RPM
Storage capacity
4 TB
4 TB
3 TB
4 TB
2 TB
6 TB
14 TB
2 TB
3 TB
5 TB
Price/TB
22.5 £/TB
19 £/TB
25 £/TB
23.5 £/TB
22.5 £/TB
26.67 £/TB
26.43 £/TB
35.5 £/TB
19.67 £/TB
16.2 £/TB
Unrecoverable Read Error (URE)
1 per 10^14
1 per 10^14
1 per 10^14
1 per 10^14
1 per 10^15
1 per 10^14
1 per 10^14
1 per 10^14
1 per 10^14
1 per 10^14