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WD Caviar WD800LB 2MB 80GB vs. WD Red WD40EFRX 64MB 4TB + 8
Noise level
35 dB
23 - 27 dB
25 - 28 dB
27 - 28 dB
23 - 26 dB
34 dB
22 - 27 dB
26 - 28 dB
28 - 34 dB
25 - 28 dB
Connection
IDE
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
S-ATA
Interface
ATA 100
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
147 mm
146.99 mm
146.99 mm
147 mm
146.99 mm
146.99 mm
147 mm
147 mm
Height
26.1 mm
26.1 mm
26.1 mm
26.11 mm
26.1 mm
20.17 mm
20.2 mm
26.1 mm
26.1 mm
Width
101.6 mm
101.6 mm
101.8 mm
101.85 mm
101.85 mm
101.6 mm
101.85 mm
101.8 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
3.5 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
ERC (Error Recovery Control), NAS-optimized
NAS-optimized
NAS-optimized
NAS-optimized
Cache size
2 MB
64 MB
64 MB
128 MB
64 MB
256 MB
256 MB
256 MB
256 MB
64 MB
Hybrid disk (SSHD)
No
No
No
No
No
No
No
No
No
No
Recording technology
CMR
CMR
CMR
CMR
CMR
SMR
SMR
CMR
SMR
Release year
2013
2014
2016
2020
2017
2017
2019
2015
Operational Power Consumption (min-max)
3.3 - 4.5 W
3.4 - 5.3 W
15.7 W
3.95 - 4.8 W
6.33 - 8.61 W
0.25 - 3.7 W
3.9 - 5.1 W
6.3 - 10 W
3.4 - 5.3 W
Power consumption (standby)
0.4 W
0.4 W
0.5 W
0.25 W
0.3 W
5 W
0.4 W
Advanced Format (AF)
512e
512e
512e
4Kn
512e
4Kn
512e
Internal transfer rate
150 MB/s
175 MB/s
263.38 MB/s
241 MB/s
190 MB/s
220 MB/s
261 MB/s
150 MB/s
Mean Time Between Failure (MTBF)
1000000 h
1000000 h
1200000 h
1000000 h
1000000 h
1000000 h
2500000 h
Number of disks (platters)
4
5
3
3
2
1
9
4
Rotational speed
7200 RPM
5400 RPM
5400 RPM
7200 RPM
5900 RPM
7200 RPM
5400 RPM
7200 RPM
7200 RPM
5400 RPM
Storage capacity
0.08 TB
4 TB
6 TB
4 TB
4 TB
8 TB
4 TB
2 TB
16 TB
4 TB
Price/TB
500 £/TB
23.25 £/TB
26.33 £/TB
28.5 £/TB
22.5 £/TB
20.63 £/TB
18.25 £/TB
21 £/TB
19.63 £/TB
20 £/TB
Unrecoverable Read Error (URE)
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 10^15
1 per 10^15
1 per 10^14