Western Digital WD vs Seagate Green hard disks – PC Accessories Review

Ever since I started using Network Access Storage (NAS), I have switched to use Green hard disks, in line with an aim to save energy consumption. TO me there is no great difference in performance, at least observable for now when primarily the traffic to my blog is still growing and video streaming is not my key activity.

However, there are know differences between the Green hard disk vs a High Performance one (Black):

1. The Black hard drive’s performance is considered to be far better than the Green hard drive’s performance.
2. The Black is noisy, and also consumes more power. On the other hand, the Green makes less noise, and has a more efficient power consumption rate.
3. While the Green hard drive has a 5400-rpm speed, the Black hard drive has a 7200-rpm speed.
4. The Green drives use only 35 percent less energy when writing or reading, when compared to Black drives.
5. The Green drives are cheaper than the Blacks drives.

As of now, there are a few major types of Green hard disk:

Western Digital (WD) : WD AV-GP, WD20EARS
Seagate :  ST2000DL003, ST32000542AS

I would discourage Western Digital WD AV-GP.

The AV drives ignore errors, the normal drives will do an error recovery to attempt to get back any data from the platter.
When recording video (security cameras etc) you want an AV drive that will just record whatever you throw at it, and keep going even if it misses a byte or two. An error in a couple of bytes just causes a minor blip in the video stream, but the rest won’t stop. On a normal drive it could go into an error recovery mode and stop recording for 10-30 seconds – and this is much worse for security.

However if you store documents, a single byte error could corrupt megabytes or even gigabytes of important data.

 

I would strongly recommend Seagate ST2000DL003 which is a SATA3 model with transfer speed max at 6Gbps with the other models at 3Gbps.

Baracuda green

MORE SPECIFICATIONS (extracted from Manufacturer’s website):

WD AV-GP ( WD20EURS)

Performance Specifications
Rotational Speed IntelliPower *
Buffer Size 64 MB
Acoustics (Sone) < 1
Transfer Rates
Buffer To Host (Serial ATA) 3 Gb/s (Max)

Physical Specifications
Formatted Capacity 2,000,398 MB
Capacity 2 TB
Interface SATA 3 Gb/s
User Sectors Per Drive 3,907,029,168

Physical Dimensions
English
Height 1.028 Inches
Depth 5.787 Inches
Width 4.00 Inches
Weight 1.40 Pounds
Metric
Height 26.1 mm
Depth 147 mm
Width 101.6 mm
Weight 0.64 kg

Environmental Specifications
Shock
Operating Shock (Read) 65G, 2 ms
Non-operating Shock 250G, 2 ms
Acoustics
Idle Mode 24 dBA (average)
Seek Mode 3 25 dBA (average)
Temperature (English)
Operating 32° F to 140° F
Non-operating -40° F to 158° F
Temperature (Metric)
Operating -0° C to 60° C
Non-operating -40° C to 70° C

Electrical Specifications
Current Requirements
Power Dissipation
Read/Write 4.50 Watts
Idle 4.00 Watts
Standby 0.70 Watts
Sleep 0.70 Watts

 

 

 

WD Caviar Green 2 TB SATA Hard Drives ( WD20EARS)

Performance Specifications
Rotational Speed IntelliPower *
Buffer Size 64 MB
Transfer Rates
Buffer To Host (Serial ATA) 3 Gb/s (Max)

Physical Specifications
Formatted Capacity 2,000,398 MB
Capacity 2 TB
Interface SATA 3 Gb/s
User Sectors Per Drive 3,907,029,168

Physical Dimensions
English
Height 1.028 Inches
Depth 5.787 Inches
Width 4.00 Inches
Weight 1.61 Pounds
Metric
Height 26.1 mm
Depth 147 mm
Width 101.6 mm
Weight 0.73 kg

Environmental Specifications
Shock
Operating Shock (Read) 65G, 2 ms
Non-operating Shock 250G, 2 ms
Acoustics
Idle Mode 24 dBA (average)
Seek Mode 0 29 dBA (average)
Seek Mode 3 25 dBA (average)
Temperature (English)
Operating 32° F to 140° F
Non-operating -40° F to 158° F
Temperature (Metric)
Operating -0° C to 60° C
Non-operating -40° C to 70° C

Electrical Specifications
Current Requirements
12 VDC
Read/Write 296 mA
Idle 243 mA
Standby 3 mA
Sleep 3 mA
5 VDC
Read/Write 503 mA
Idle 172 mA
Standby 160 mA
Sleep 160 mA
Power Dissipation
Read/Write 6.00 Watts
Idle 3.70 Watts
Standby 0.80 Watts
Sleep 0.80 Watts

 

 

Barracuda® Green SATA 6Gb/s 2TB Hard Drive

ST2000DL003

SPECIFICATIONS
Model Number ST2000DL003
Interface SATA 6Gb/s
Cache 64MB
Capacity 2TB
Areal density (avg) 422Gb/in2
Guaranteed Sectors 3,907,029,168
PHYSICAL
Height 26.1mm (1.028 in)
Width 101.6mm (4.0 in)
Length 147.00mm (5.78 in)
Weight (typical) 635g (1.39 lb)
PERFORMANCE
Spin Speed (RPM) 5900 RPM
Sustained data transfer rate 144Mb/s
Average latency 4.16ms
Random read seek time 12.0ms
Random write seek time 13.0ms
I/O data transfer rate 600MB/s
Unrecoverable read errors 1 in 1014
POWER
12V start max current 2.0A
Average idle power 4.5W
Average operating power 5.8W
ENVIRONMENT
AMBIENT TEMPERATURE
Operating 0°–60°C
Nonoperating -40°–70°C
Maximum operating temperature change 20°C per hour
Maximum nonoperating temperature change 30°C per hour
SHOCK
Operating Shock (max) 70 Gs for 2ms
Nonoperating Shock (max) 300 Gs for 2ms
ACOUSTICS
Acoustics (Idle Volume) 2.1 bels
Acoustics (Seek Volume) 2.3 bels

 

Barracuda® Green SATA 3Gb/s 2TB Hard Drive

ST32000542AS

SPECIFICATIONS
Model Number ST32000542AS
Interface SATA 3Gb/s
Cache 32MB
Capacity 2TB
Areal density (avg) 341.5Gb/in2
Guaranteed Sectors 3,907,029,168
PHYSICAL
Height 26.1mm (1.028 in)
Width 101.85mm (4.010 in)
Length 146.99mm (5.787 in)
Weight (typical) 655g (1.444 lb)
PERFORMANCE
Spin Speed (RPM) 5900 RPM
Sustained data transfer rate 95Mb/s
Average latency 5.1ms
Random read seek time <16.0ms
Random write seek time <16.0ms
I/O data transfer rate 300MB/s
Unrecoverable read errors 1 in 1014
POWER
12V start max current 2.0A
Average idle power 4.85W
Average operating power 6.90W
ENVIRONMENT
AMBIENT TEMPERATURE
Operating 0°–60°C
Nonoperating -40°–70°C
Maximum operating temperature change 20°C per hour
Maximum nonoperating temperature change 30°C per hour
SHOCK
Operating Shock (max) 70 Gs for 2ms
Nonoperating Shock (max) 300 Gs for 2ms
ACOUSTICS
Acoustics (Idle Volume) 2.5 bels
Acoustics (Seek Volume) 2.6 bels

 

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