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Seagate Momentus 7200.4 500GB SATA Notebook Hard Drive
This year has been inarguably the most exciting year for one of the
least exciting components of the PC, the venerable hard disk drive.
It's no secret that SSDs have started to shake things up in the
storage market, showing huge performance potential. However,
as promising as the SSD is, there are still serious drawbacks with
the new technology, providing an avenue for the rotational drive
manufacturers to capitalize on. The advantages of the
rotational drive are primarily these two things: capacity and price.
And so, it just happens that the Club has a sample of Seagate's
latest volley into the laptop hard drive market: the Momentus
7200.4 500GB 2.5" drive. The creation of a 500GB hard drive
into a 2.5" form factor is an important one; it finally allows real
mass storage to be used in today's mobile lifestyle. Even more
than that, such high capacity in such a small space enables many
more uses than just laptop replacements; it's not hard to imagine
such drives being used in enclosures, ultra-slim HTPCs, DVRs, and
network appliances. Even better yet, the enhanced spindle
speeds of 7200RPMs should enable a better overall user experience.
So how does it perform? Read on and find out!

While the Momentus 7200.4 looks like pretty much
any other laptop hard drive, however, the excitement comes from
within, with its high capacity, fast speeds, and 16MB cache.
Key Advantages
- Highest available notebook performance
- 500GB capacity
- Native Command Queuing
- Lowest power 7200RPM laptop drive yet
- Ramp load features improve idle power
consumption
- State-of-the-art error correction
- S.M.A.R.T. drive monitoring support
- Support for Read Multiple and Write Multiple
commands
Best-Fit Applications
- High-performance and mainstream laptops
- Small form factor PCs
- Industrial applications
- Non-mission-critical blade servers

Momentus 7200.4 Specifications
| Specifications |
| Model Number |
ST9500420AS |
| Interface |
SATA 3.0Gb/s |
| Cache |
16 MBytes |
| Capacity |
500 GB |
| Areal density (avg) |
394 Gbits/inch2 |
| Guaranteed Sectors |
976,773,168 |
| Physical |
| Height (max) |
9.5 mm (0.374 inches) |
| Width (max) |
69.85 mm (2.75 inches) |
| Length (max) |
100.35 mm (3.957 inches) |
| Weight (typical) |
110 grams (.238 pounds) |
| Performance |
| Spindle Speed |
7200 rpm |
| Average latency |
4.17 msec |
| Random read seek time |
11.0 msec |
| Reliability |
| Annual Failure Rate |
0.5 |
| Power |
| 5V start max current |
1.0 amps |
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