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The WD Caviar Green 2TB
The WD Caviar Green 2TB hard drive looks like any other 3.5" desktop hard drive, with a label on the top plate and an uncovered PCB on the underside.
The label has a lot of important information, like the hard drive model and capacity, and jumper settings. There are also interesting details like its date and place of manufacture. This particular drive was manufactured in Thailand in February 2009. The underside is SOP for Western Digital - totally bare of any surface-mounted components.
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The label is also where you look for the drive's serial number in case you need to RMA it. Of course, we hope that never happens! 
Usable Capacity
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This Western Digital Caviar Green drive officially has a formatted capacity of 2,000,398 MB. We checked that out by formatting both in NTFS using Windows Vista.
The actual formatted capacity was 2,000,396,742,656 bytes. This is slightly (1.3 MB) lower than the official formatted capacity. With about 147 MB allocated to the NTFS file system, the actual usable capacity remained slightly above 2 TB.
Let's take a look at its specifications.
Specifications
Model |
• WD20EADS (32 MB) |
Formatted Capacity |
• 2,000,398 MB |
Guaranteed Sectors |
• 3,907,029,168 |
Bytes Per Sector |
• 512 bytes |
Sectors Per Track |
• NA |
Cylinders |
• NA |
Platters |
• 4 Platters |
Read/Write Heads |
• 8 Read/Write Heads |
Recording Method |
• NA |
Interleave |
• 1 : 1 |
Spindle Speed |
• Fixed, between 5,400 to 7,200 RPM |
Cache Buffer |
• 32 MB SDRAM |
Internal Data Transfer Rate |
• 100 MB/s (sustained) |
Maximum I/O Transfer Rate |
• 3.0 Gbits/s |
Average Seek |
• NA |
Average Latency |
• NA |
Drive Ready Time |
• 14.5 seconds (average) |
Interface |
• Serial ATA 3.0Gb/s |
Supported SATA Data Transfer Mode |
• 3.0 Gbits/s |
SATA Hotplug Capability |
• Yes |
Maximum Height |
• 26.1 mm (1.028 inches) |
Maximum Width |
• 101.6 mm (4.00 inches) |
Maximum Length |
• 147.0 mm (5.787 inches) |
Maximum Weight |
• 489 g (1.08 lbs) |
Power Requirements |
• +12V DC ± 10 % |
Power Consumption |
• 7.4 W (Read / Write) |
Ambient Temperature |
• 5 °C to 55 °C
(Operating) |
Maximum Shock |
• 65 G @ 2 ms (Read/Write) |
Drive Acoustics |
• 24 dBA average (Idle Mode) |
Non-Recoverable Read Errors |
• 1 error per 1015 bits read |
Load/Unload Cycles |
• 300,000 (minimum) |
MTBF |
• NA |
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