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  • Seagate Momentus 7200 500GB 7200RPM SATA 3Gb/s 16MB Cache 2.5 Inch Internal NB Hard Drive ST9500420AS-Bare Drive
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Seagate Momentus 7200 500GB 7200RPM SATA 3Gb/s 16MB Cache 2.5 Inch Internal NB Hard Drive ST9500420AS-Bare Drive

by Seagate
| 20 answered questions

List Price: $119.99
Price: $59.55 & FREE Shipping
You Save: $60.44 (50%)
In Stock.
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  • Two Year Warranty
  • Best-Fit Applications; High-performance and mainstream laptop PCs, Small form factor PCs, Workstations, Industrial applications
  • SATA 3.0Gb/s Interface, 500 GB Capacity
  • 7,200 RPM Spin Speed,16 MB Cache Buffer
  • Average latency 4.17 msec, Random read seek time 11.0 msec, Random write seek time 13.0 msec
24 new from $55.00 9 used from $28.50 5 refurbished from $82.90

Frequently Bought Together

Seagate Momentus 7200 500GB 7200RPM SATA 3Gb/s 16MB Cache 2.5 Inch Internal NB Hard Drive ST9500420AS-Bare Drive + Sabrent Ultra Slim USB 2.0 to 2.5-Inch SATA External Aluminum Hard Drive Enclosure [Black] (EC-UK25)
Price for both: $67.54

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This item: Seagate Momentus 7200 500GB 7200RPM SATA 3Gb/s 16MB Cache 2.5 Inch Internal NB Hard Drive ST9500420AS-Bare Drive
Customer Rating (156) (738) (143) (500)
Price $ 59.55 $ 74.76 $ 43.11 $ 53.90
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By uBestDeals Ulike Computer Upgrade King uBestDeals
Hard Disk Size 500 GB 500 GB 500 GB 500 GB
Speed 7200 rpm 7200 rpm 7200 rpm 7200 rpm
Form Factor 2.5-Inch 2.5 inch 2.5 inch 2.5 inch
Hardware Interface Information not Provided sata 3 0 gb sata 6 0 gb Information not Provided
Cache Memory Installed 16 MB Information not Provided 32 16 MB
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Technical Details

  • Brand Name: Seagate
  • Model: ST9500420AS
  • Hard Disk Size: 500 GB
  • Warranty: 3 Year Warranty
  • Form Factor: 2.5-Inch
See more technical details

Product Details

  • Product Dimensions: 12 x 6 x 6 inches ; 7.2 ounces
  • Shipping Weight: 4 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B001R4BBLU
  • Item model number: ST9500420AS
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (156 customer reviews)
  • Product Warranty: For warranty information about this product, please click here
  • Date first available at Amazon.com: September 14, 2004

Product Description

Product Description

Momentus 7200.4 2.5Inch 500Gb 7200Rpm 8Cch Sata

From the Manufacturer

The Seagate® Momentus® 2.5-inch drive is the world's most feature-rich 2.5-inch drive for laptops and external enclosures. Momentus drives deliver solutions and customer confidence with options in speed and capacity, and innovative features such as Self-Encrypting Drives and drop sensor technology. Choose from six capacities: 750, 640, 500, 320, 250 and 160GB; two performance speeds: 7200 RPM and 5400 RPM; and three innovative features: Self-Encrypting Drives, FIPS 140-2 certification (in process) and free-fall drop sensor. Momentus drives give you the power to transform from ordinary to extraordinary.

Seagate® Momentus®

Momentus Drive
Momentus Laptop Hard Drives
What the experts are saying...
The world's most feature-rich 2.5-inch drive for laptop upgrades and external enclosures. The Momentus drive family offers innovative options, capacities to 750GB, two performance speeds and significant feature options. The Seagate Momentus drives are perfect for any standard laptop and meet your specific upgrade needs whether they are:
  • More Capacity
  • Higher Performance
  • Lower Power Consumption
  • More Security
  • Greater Reliability
Why choose the Seagate Momentus?
  • 7200-RPM and 5400-RPM speeds and 8MB and 16MB cache size to increase application performance
  • 750, 640, 500, 320, 250 and 160GB models for 5400-RPM drives
  • 750, 500, 320, 250 and 160GB models for 7200-RPM drives
  • Seagate SmartAlign™ technology provides a transition to 4K sectors without the need for software utilities
  • *Optional FIPS 140-2 Validated™ Seagate Self-Encrypting Drive technology delivers government-grade encryption without performance degradation - protecting your data where it lives.
  • Optional Seagate G-Force Protection™ technology can detect when your laptop is in a free-fall, swing the drive heads to a safe zone and keep the data safe.
*Not available in all models or countries. Requires TCG-compliant host or controller support. TM: The FIPS logo is a certification mark of NIST, which does not imply product endorsement by NIST, the U.S., or Canadian governments.
Overclockers Club logo "The overall read and write speeds were the best of the comparison drives for all of the testing, reaching over 100MB a second at one point. The fact that this is a 2.5" hard drive this makes it a great contender..."
- Overclockers Club, August 2009
Bjorn3D logo "Forget the charts, forget the benches we had a real life winner here. The 7200 RPM platter speed consuming only .05v more voltage than a 5200 RPM drive had won us over quickly."
- Bjorn3D, April 2009
TechTree logo "The Seagate Momentus ST9500420AS is one hell of a performer and the 500 GB capacity makes it an excellent choice for notebooks to be used as desktop replacements."
- TechTree, May 2009
Buzzilions logo "Seagate Momentus 7200.4 Mobile Hard Drive (ST9500420AS) Buzzilions Reviewers Choice Finalist 2010. Ranked #14"
- Buzzilions, 2010
Tom's Hardware logo "Seagate dominates the performance segment with the Momentus 7200.4."
- Tom's Hardware, June 2009

 
 
 
The world's most feature-rich 2.5-inch drive for laptop upgrades and external enclosures now available up to 750GB!
Momentus  
 

 
Seagate® Momentus® Family Hard Drives

GoFlex Desk Hard Drive
Seagate® Momentus®
5400 & 7200 RPM drives
with capacities up to 750GB
GoFlex Desk Hard Drive
Seagate® Momentus® XT
Solid State Hybrid drives
with Adaptive Memory Technology
click here

 
Momentus Specifications
  Momentus 5400 Drives Momentus 7200 Drives
Feature Options 640GB1 500GB1 320GB1 250GB1 160GB1 750GB1 500GB1 320GB1 250GB1 160GB1
Standard Models ST9640320AS ST9500325AS ST9320325AS ST9250315AS ST9160314AS ST9750420AS ST9500420AS ST9320423AS ST9250410AS ST9160412AS
Free-Fall Sensor Models ST9500325ASG2 ST9500420ASG2 ST9250410ASG2
FDE Models ST9500327AS ST9250317AS ST9500421AS ST9250411AS
FDE FIPS 140-2 Models ST9500422AS ST9250412AS
Interface SATA 3Gb/s NCQ SATA 3Gb/s NCQ SATA 3Gb/s NCQ SATA 3Gb/s NCQ SATA 3Gb/s NCQ SATA 3Gb/s NCQ SATA 3Gb/s NCQ SATA 3Gb/s NCQ SATA 3Gb/s NCQ SATA 3Gb/s NCQ
Cache (MB) 8 8 8 8 8 16 16 16 16 16
Configuration    
Bytes per Sector 512 512 512 512 512 40963 512 512 512 512
Reliability/Data Integrity    
Head-Rest Method Quiet Step™ Ramp Load Quiet Step Ramp Load Quiet Step Ramp Load Quiet Step Ramp Load Quiet Step Ramp Load Quiet Step Ramp Load Quiet Step Ramp Load Quiet Step Ramp Load Quiet Step Ramp Load Quiet Step Ramp Load
Load/Unload Cycles >600,000 >600,000 >600,000 >600,000 >600,000 >600,000 >600,000 >600,000 >600,000 >600,000
Nonrecoverable Read Errors per Bits Read 1 per 10E14 1 per 10E14 1 per 10E14 1 per 10E14 1 per 10E14 1 per 10E14 1 per 10E14 1 per 10E14 1 per 10E14 1 per 10E14
Annualized Failure Rate (AFR) 0.48% 0.48% 0.48% 0.48% 0.48% 0.50% 0.50% 0.50% 0.50% 0.50%
Power Management    
Power (W)
  Seek, Typical
  Idle, Typical
 
1.3
0.68
 
1.54
0.81
 
1.54
0.81
 
1.54
0.81
 
1.54
0.81
 
1.5
0.7
 
1.554
0.67
 
1.554
0.67
 
1.554
0.67
 
1.554
0.67
Environmental    
Temperature (°C)
  Operating
  Nonoperating
 
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
 
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: 2ms
  Nonoperating: 1ms
 
350
1000
 
350
1000
 
350
1000
 
350
1000
 
350
1000
 
350
1000
 
350
1000
 
350
1000
 
350
1000
 
350
1000
Acoustics (bels—
sound power)
  Idle, Typical
  Seek, Typical
 
 
2.3
2.6
 
 
2.4
2.6
 
 
2.4
2.6
 
 
2.4
2.6
 
 
2.4
2.6
 
 
2.3
2.5
 
 
2.3
2.5
 
 
2.3
2.5
 
 
2.3
2.5
 
 
2.3
2.5
Physical    
Height (in/mm) 0.374/9.5 0.374/9.5 0.374/9.5 0.374/9.5 0.374/9.5 0.370/9.5 0.370/9.5 0.370/9.5 0.370/9.5 0.370/9.5
Width (in/mm) 2.75/69.85 2.75/69.85 2.75/69.85 2.75/69.85 2.75/69.85 2.75/69.85 2.75/69.85 2.75/69.85 2.75/69.85 2.75/69.85
Depth (in/mm) 3.957/100.5 3.957/100.5 3.957/100.5 3.957/100.5 3.957/100.5 3.951/100.35 3.951/100.35 3.951/100.35 3.951/100.35 3.951/100.35
Weight (lb/g) 0.218/98.8 0.218/98.8 0.218/98.8 0.218/98.8 0.218/98.8 0.254/115 0.238/110 0.238/110 0.227/105 0.227/105
1 One gigabyte, or GB, equals one billion bytes and one terabyte, or TB, equals one trillion bytes when referring to drive capacity.
2 Drive with G-Force Protection™ feature
3 Advanced Sector Format (4K) drive with SmartAlign™ technology resolves misalignment conditions.

Customer Questions & Answers

Customer Reviews

Installation was a breeze and it has been working very well so far.
erturne
The laptop was just under a year old and the hard drive in it was fine but I needed more space for storage and the extra speed increase was a definite plus for me.
Kapone
The hard drive was installed in a 13" Macbook PRO to replace the original hard drive (5400rpm 250gb).
D. Lapiduz

Most Helpful Customer Reviews

230 of 265 people found the following review helpful By stuffgeeekswant-dot-com on November 10, 2009
Read the 5 pages of support issues on this drive in Seagate's forums or the 30+ pages in Apple's forums (and note: this isn't an issue exclusive to Apple systems)... or read the reviews at Newegg... this drive has MAJOR reliability issues.

Don't believe all these 5 star reviews from people who reviewed the drive the day they installed it. It will run great when you first put it in.

But 15-60 days in you will start hearing clunking noises. Your system will start freezing for a second or two here or there. The drive's load cycle count will start to skyrocket (to the point that even under "normal" use the drive will fail within a year by Seagate's own numbers). If you're really unlucky, the drive will suddenly die.

Don't play russian roulette with your data. Don't fall for this drive's relatively low price or nice specs.

The most important spec in a hard drive is reliability. This one sucks.
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100 of 115 people found the following review helpful By Jonathan Birge TOP 1000 REVIEWERVINE VOICE on December 1, 2009
I am not going to say there is something wrong with these drives, because at the end of the day I'm only one guy with a bad experience. I'll just offer my review here so that people get a full perspective. I have had two of these fail on me in a row, failing offline SMART tests. When it was working, the drive was very fast and quiet, though, so I can certainly understand the high marks people give these drives when they work.

I think it is fair to say that Seagate is really running these at the ragged edge of what is possible. While the transfer rates can approach 90 Mb/s at the edge of the platter, according to a few quick tests I ran, the transfer rate fluctuates greatly, and the drive shows a pretty constant stream of software-corrected (ECC) errors. In other words, you're not losing data, but the data coming off the drive is on the border of what is readable, such that the drive needs to rely on error correction and/or rereads (hence the fluctuating speeds) to get the data off. I base these conclusions on the fact that tests of data on the inside of the platter (which has much less speed) are much more reliable (albeit slower).

If you do decide to get one of these, do yourself a favor and backup (which you should do anyways, because all hard drives are subject to fail at any time).
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58 of 69 people found the following review helpful By Adel Sabry Elkhouly on September 8, 2009
I was really worried to buy this drive cause of the reviews I read, but I bought it because of the reputation of seagate, as my old drive was seagate momentus too but 160 GB, I did replace it with this 500 GB model, and found no Vibration as many people claimed, the same as Hitachi, western Digital.

I ordered two hard drives
Installed the first in a Macbook Pro 17" 2.4 GHz SR, everything is perfect. I am not sure about the battery life after replacing the drive as I did upgrade the OS to snow leopard afterwords so I can't judge the battery level fairly.

The second drive did install it in a White Macbook 2.4 Ghz, to replace a 5400rpm 160 GB Hitachi, there is a real significant difference between the old Hitachi, and this drive for sure, the Macbook is really flying now, boot times are faster, and applications load fast too. The over All performance did boast I guess 40% more.

White Macbook:
Vibration: No
Speed: Yes
Battery consumption: Yes, the battery don't last as the 5400 Hitachi
Worth Upgrade: yes 100 %

Macbook Pro:
Vibration: No
Speed: Yes
Battery consumption: Yes, the battery don't last as the 7200 160 GB Momentus
Worth Upgrade: yes 100 %

I do recommend this product
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25 of 28 people found the following review helpful By Dmitry on September 15, 2009
My drive started to make a loud "clunk" sound about a week after I installed it. I just spoke with Seagate warranty department and they said that it would cost me $19.95 to have them ship me a new drive under warranty. The warranty rep said that neither he nor his managers have the authority to waive this fee. It'll cost me nothing to return it to the retailer as defective, so I'll do that today instead.

Edited to add:

The replacement drive is now making the "clunk" sound as well and needs to be replaced. This time, I'll go with a brand other than Seagate.

Warranty experience: The second failed drive was shipped to Seagate eleven days ago and they still show my claim as "not recieved". According to my delivery confirmation query, USPS delivered it to their location right on the border of Mexico and Texas, so I assume that Seagate then ships it to some warehouse in Mexico where the recieving process is SLOWLY completed. Speaking with Seagate's stern warranty reps was interesting: If you use bubble wrap or packing peanuts when you ship the drive, they will void the warranty! Seagate offers a .pdf file with very strict shipping instructions, including a specific 2-inch thick foam that you must use for packaging. I wonder how many warranty claims Seagate invalidates for failure to meet their unusually weird shipping instructions.

In the meantime, I installed a 500GB Hitachi drive that runs perfectly. No more clunking and my notebook no longer vibrates like a blender. The Hitachi drive is completely silent, fast, and runs much colder than the Seagate clunker.
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