Specifications1 3 TB 3 TB 2.5 TB 2.5 TB 2 TB 2 TB
Model number WD30EZRX WD30EZRSDTL WD25EZRX WD25EZRSDTL WD20EARX WD20EARS
Interface SATA 6 Gb/s SATA 3 Gb/s SATA 6 Gb/s SATA 3 Gb/s SATA 6Gb/s SATA 3 Gb/s
Formatted capacity 3,000,592 MB 3,000,592 MB 2,500,495 MB 2,500,495 MB 2,000,398 MB 2,000,398 MB
User sectors per drive 5,860,533,168 5,860,533,168 4,883,781,168 4,883,781,168 3,907,029,168 3,907,029,168
Advanced Format (AF) Yes Yes Yes Yes Yes Yes
SATA latching connector Yes Yes Yes Yes Yes Yes
Form factor 3.5-inch 3.5-inch 3.5-inch 3.5-inch 3.5-inch 3.5-inch
RoHS compliant2 Yes Yes Yes Yes Yes Yes
Performance
Data transfer rate (max)
Buffer to host
Host to/from drive (sustained)
6 Gb/s
123 MB/s
3 Gb/s
123 MB/s
6 Gb/s
123 MB/s
3 Gb/s
123 MB/s
6 Gb/s
110 MB/s
3 Gb/s
110 MB/s
Cache (MB) 64 64 64 64 64 64
Rotational speed (RPM) IntelliPower IntelliPower IntelliPower IntelliPower IntelliPower IntelliPower
Reliability/Data Integrity
Load/unload cycles3 300,000 300,000 300,000 300,000 300,000 300,000
Non-recoverable read errors
per bits read
<1 in 1014 <1 in 1014 <1 in 1014 <1 in 1014 <1 in 1014 <1 in 1014
Limited warranty (years)4 3 3 3 3 3 3
Power Management
12VDC (A, peak) 1.78 1.78 1.78 1.78 1.75 1.75
Average power requirements (W)
Read/write
Idle
Standby
Sleep
6
5.5
0.8
0.8
6
5.5
0.8
0.8
6
5.5
0.8
0.8
6
5.5
0.8
0.8
5.3
3.3
0.7
0.7
5.3
3.3
0.7
0.7
Environmental Specifications5
Temperature (°C)
Operating
Non-operating
0 to 60
-40 to 70
0 to 60
-40 to 70
0 to 60
-40 to 70
0 to 60
-40 to 70
0 to 60
-40 to 70
0 to 60
-40 to 70
Shock (Gs)
Operating (2 ms, read)
Operating (2 ms, read/write)
Non-operating (1 ms)
30
65
250
30
65
250
30
65
250
30
65
250
30
65
250
30
65
250
Average acoustics (dBA)6
Idle mode
Performance seek mode
Quiet seek mode
24
29
25
24
29
25
24
29
25
24
29
25
24
29
25
24
29
25
Physical Dimensions
Height (in./mm, max) 1.028/25.4 1.028/25.4 1.028/25.4 1.028/25.4 1.028/25.4 1.028/25.4
Length (in./mm, max) 5.787/147 5.787/147 5.787/147 5.787/147 5.787/147 5.787/147
Width (in./mm, ± .01 in.) 4/101.6 4/101.6 4/101.6 4/101.6 4/101.6 4/101.6
Weight (lb./kg, ± 10%) 1.61/0.73 1.61/0.73 1.61/0.73 1.61/0.73 1.40/0.64 1.40/0.64