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The WD Scorpio Blue 640 GB
The WD Scorpio Blue 640 GB hard disk drive looks like any other 2.5" mobile 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, capacity and serial number. There are also interesting details like its date and place of manufacture. This particular drive was manufactured in Thailand on August 31, 2009.
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The underside is SOP for Western Digital - completely bare of any surface-mounted components.
Usable Capacity
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This Western Digital Scorpio Blue drive officially has a formatted capacity of 640,135 MB. We checked that out by formatting both in NTFS using Microsoft Windows Vista.
The actual formatted capacity was 640,132,575,232 bytes. This is slightly (132 MB) higher than the official formatted capacity. With about 113 MB allocated to the NTFS file system, the actual usable capacity remained slightly above 640 GB.
Let's take a look at its specifications.
Specifications
Model |
• WD6400BEVT |
Formatted Capacity |
• 640,135 MB |
Guaranteed Sectors |
• 1,250,263,728 |
Bytes Per Sector |
• 512 bytes |
Sectors Per Track |
• NA |
Cylinders |
• NA |
Platters |
• 3 Platters |
Read/Write Heads |
• 6 Read/Write Heads |
Recording Method |
• NA |
Interleave |
• 1 : 1 |
Spindle Speed |
• 5,400 RPM |
Cache Buffer |
• 8 MB SDRAM |
Internal Data Transfer Rate |
• 106 MB/s (sustained, maximum) |
Maximum I/O Transfer Rate |
• 3.0 Gbits/s |
Average Seek |
• 12.0 ms |
Track-to-Track Seek |
• 2.0 ms (average) |
Average Latency |
• 5.5 ms |
Drive Ready Time |
• 4 seconds (average) |
Interface |
• Serial ATA 3 Gb/s |
Supported SATA Data Transfer Mode |
• 3.0 Gbits/s |
SATA Hotplug Capability |
• Yes |
Maximum Height |
• 9.5 mm |
Maximum Width |
• 69.85 mm |
Maximum Length |
• 100.2 mm |
Maximum Weight |
• 117 g |
Power Requirements |
• +12V DC ± 10 % |
Power Consumption |
• 2.5 W (Read / Write) |
Ambient Temperature |
• 0 °C to 60 °C
(Operating) |
Maximum Shock |
• 350 G @ 2 ms (Read) |
Drive Acoustics |
• 23 dBA average (Idle Mode) |
Non-Recoverable Read Errors |
• 1 error per 1014 bits read |
Load/Unload Cycles |
• 600,000 (minimum) |
MTBF |
• NA |
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