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The WD VelociRaptor (WD1000DHTZ)
The Western Digital VelociRaptor 1 TB (WD1000DHTZ) is based on the same form factor as the previous VelociRaptor designs. Although labelled as a 2.5" drive, the VelociRaptors are physically thicker than standard 2.5" hard disk drives at 15 mm, while regular 2.5" hard disk drives are just 9.5 mm thick. Therefore, it is not possible to slide a VelociRaptor into any notebook, just in case you are thinking about it!
The DHTZ model comes with the IcePack heatsink / mounting frame pre-installed. This allows the VelociRaptor 1 TB hard disk drive to conform to the industry standards for 3.5" hard disk drives. It will fit into any standard 3.5" drive bay and is even ready for backplane mounting.
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The label has a lot of important information, like the hard drive model and capacity. There are also interesting details like its date and place of manufacture. This particular drive was manufactured in Malaysia on the 13th of April 2012. The underside is SOP for Western Digital - completely bare of any surface-mounted components.
Usable Capacity
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This Western Digital VelociRaptor 1 TB drive officially has a formatted capacity of 1,000,204 MB. We checked that out by formatting it in NTFS using Microsoft Windows 7.
The actual formatted capacity was 1,000,202,039,296 bytes. This is slightly (2 MB) less than the official formatted capacity. With about 124 MB allocated to the NTFS file system, the actual usable capacity remained slightly above 1 TB.
Let's take a look at its specifications, and compare it against its older brethren.
Specification Comparison
Specifications |
VelociRaptor 1 TB |
VelociRaptor 600 GB |
VelociRaptor 300 GB |
Model |
• WD1000DHTZ |
•WD6000HLHX |
• WD3000HLFS |
Formatted Capacity |
• 1,000,204 MB |
• 600,127 MB |
• 300,069 MB |
Guaranteed Sectors |
• 1,953,525,169 |
• 1,172,123,568 |
• 586,072,368 |
Bytes Per Sector |
• 512 bytes (Emulated) |
• 512 bytes |
• 512 bytes |
Platters |
• 3 Platters |
• 2 Platters |
|
Read/Write Heads |
• 6 Read/Write Heads |
• 4 Read/Write Heads |
|
Recording Method |
• Perpendicular Magnetic Recording (PMR) |
• Longitudinal Recording |
|
Advanced Format Technology |
• Yes (512-bit Emulation Mode) |
• No |
|
Spindle Speed |
• 10,000 RPM |
||
Cache Buffer |
• 64 MB SDRAM |
• 32 MB SDRAM |
• 16 MB SDRAM |
Internal Data Transfer Rate |
• 200 MB/s (sustained, maximum) |
• 145 MB/s (sustained, maximum) |
• 126 MB/s (sustained, maximum) |
Maximum I/O Transfer Rate |
• 6.0 Gbits/s |
• 3.0 Gbits/s |
|
Average Seek |
• NA |
• 3.6 ms (read) |
• 4.2 ms (read, average) |
Average Latency |
• NA |
• 3.0 ms |
|
Drive Ready Time |
• 8 seconds |
• 7 seconds |
• 7.0 seconds (average) |
Interface |
• Serial ATA 6 Gb/s |
• Serial ATA 3 Gb/s |
|
Supported SATA Data Transfer Mode |
• 6.0 Gbits/s |
• 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 |
• 500 g (1.1 lbs) |
• 489 g (1.08 lbs) |
|
Power Requirements |
• +12V DC ± 10 % |
• +12V DC ± 10 % |
• +12V DC ± 10 % |
Power Consumption |
• 5.1 W (Random Read / Write) |
• 6.20 W (Read / Write) |
• 6.08 W (Read / Write) |
Ambient Temperature |
• 0 °C to 55 °C
(Operating) |
||
Maximum Shock |
• 30 G @ 2 ms (Read/Write) |
• 65 G @ 2 ms (Read/Write) |
|
Drive Acoustics |
• 30 dBA average (Idle) |
• 29 dBA average (Idle) |
|
Non-Recoverable Read Errors |
• 1 error per 1016 bits read |
• 1 error per 1015 bits read |
|
MTBF |
• 1,400,000 hours |
||
Load/Unload Cycles |
• 600,000 (minimum) |
• 50,000 (minimum) |
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• The WD VelociRaptor (WD1000DHTZ) |
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• Testing The WD1000DHTZ |
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