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Seagate Momentus 7200 750 GB 7200RPM SATA 3Gb/s 16 MB Cache 2.5 Inch Internal Notebook Hard Drive -Bare Drive ST9750420AS

4.4 out of 5 stars 554 customer reviews
| 66 answered questions

List Price: $109.99
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750 GB
  • Two Year Warranty
  • Ships in Certified Frustration-Free Packaging
  • 7200 RPM delivers a constant high-performance boost with capacity options up to 750GB
  • Innovative options and features - the power to transform from ordinary to extraordinary
  • Seagate SmartAlign technology provides a transition to 4K sectors without the need for software utilities
  • Innovative options and features - the power to transform from ordinary to extraordinary
  • 7200 RPM delivers a constant high-performance boost with capacity options up to 750GB
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26 new from $61.90 7 used from $29.03 3 refurbished from $39.99

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Frequently Bought Together

  • Seagate Momentus 7200 750 GB 7200RPM SATA 3Gb/s 16 MB Cache 2.5 Inch Internal Notebook Hard Drive -Bare Drive ST9750420AS
  • +
  • Crucial 8GB Kit (4GBx2) DDR3/DDR3L 1066 MT/s (PC3-8500)  SODIMM 204-Pin Mac Memory CT2K4G3S1067M / CT2C4G3S1067M
  • +
  • StarTech USB 3.0 to 2.5" SATA III Hard Drive Adapter Cable w/ UASP - SATA to USB 3.0 Converter for SSD/HDD - Hard Drive Adapter Cable
Total price: $115.93
Buy the selected items together


Technical Details

Size: 750 GB
  • Brand Name: Seagate
  • Model Number: ST9750420AS
  • Hard Disk Size: 750 GB
  • Form Factor: 2.5-Inch
  • Hard Disk Rotational Speed: 7200 RPM
See more technical details

Compare to Similar Items


This item: Seagate Momentus 7200 750 GB 7200RPM SATA 3Gb/s 16 MB Cache 2.5 Inch Internal Notebook Hard Drive -Bare Drive ST9750420AS
Customer Rating 4 out of 5 stars (554) 4 out of 5 stars (3075) 4 out of 5 stars (766) 4 out of 5 stars (923)
Price $61.90 $84.99 $59.94 $57.99
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Price Slayer Amazon.com Amazon.com WHOLESALE TAG
Hard Disk Size 750 GB 1 TB 750 GB 1 TB
Speed 7200 RPM 5400 RPM 7200 RPM 7200 RPM
Form Factor 2.5-Inch 2.5 inch 2.5 inch 2.5 inch
Hardware Interface sata 3 0 gb sata 6 0 gb sata 6 0 gb sata 6 0 gb
Cache Memory Installed 16 MB 64 16 32
Add to Cart Add to Cart Add to Cart Add to Cart

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Product Description

Size: 750 GB

Product Description

Seagate Momentus 7200 750 GB 7200RPM SATA 3Gb/s 16 MB Cache 2.5 Inch Internal Notebook Hard Drive -Bare Drive ST9750420AS

From the Manufacturer

Seagate Momentus 2.5" Internal Hard Drive

High Performance Storage

The high performance Momentus internal drive has a fast 7200RPM spindle speed and a large 16MB cache to provide desktop-like performance and deliver a sustained data transfer rate of 76MB/s. Native Command Queueing Technology dramatically increases performance by organizing incoming commands in the most efficient order. The Momentus internal drive is optimized for mobile computing and small form factor PCs that need to run more demanding applications like video and photography editing, video playback and computer games.

Seagate Momentus Laptop Hard Drive
Robust design and high shock tolerance enable mobility in rugged environments
Durable Mobility Anywhere, Anytime

Momentus is 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 it's more capacity, higher performance, lower power consumption, more security, or greater reliability.

With speeds of 7200 RPM, the Momentus series brings quality and reliability to high-performance laptops, workstations, and gamer systems, as well as mainstream laptops, netbooks and external storage enclosures. Momentus drives are ideal for any consumer solution where robustness and data reliability are a necessity.

Seagate Momentus Laptop Hard Drive
The best combination of performance, capacity, mobility and durability in a laptop hard drive

Momentus Series Technology Features

SmartAlign Technology for Easy 4K Migration

A change is coming to the hard drive industry. The smallest sector of organized data on a drive is moving from 512 to 4,096 bytes. The new format, known as Advanced Format (AF) 4K, offers advantages like increased efficiency, but migrating your drive can be challenging. Luckily, Seagate is ready to help you make a seamless transition to 4K sectors. Seagate's SmartAlign technology automatically does the work of AF migration in the background. The drive's performance is not affected, and there is no need for time-consuming utilities required by other AF-enabled drives.

Seagate Momentus 2.5-Inch Drive Specifications

Momentus 5400 Drives Momentus 7200 Drives
Momentus 750GB1 500GB1 320GB1 250GB1 750GB1 500GB1 320GB1 250GB1
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
Cache (MB) 16 8 8 8 16 16 16 16
How Much Will it Store?
Digital Music Digital Music (Hours) 12,495 8,330 5,331 4,165 12,495 8,330 5,331 4,165
Digital Photos Digital Photos (Files)
Average file size using cameras highest resolution JPEG mode
240,000 160,000 102,400 80,000 240,000 160,000 102,000 80,000
Digital Videos Digital Videos (Hours) 750 500 320 250 750 500 320 250
DVD Quality DVD Quality (Movies)
Based on standard 2 hour movie
187 125 80 63 187 125 80 63
HD Video HD Video (Hours)
Based on H.264 compression at a 6.75Mbs bitrate
187 125 80 63 187 125 80 63
1One gigabyte, or GB, equals one billion bytes and one terabyte, or TB, equals one trillion bytes when referring to drive capacity.

Product Information

Size:750 GB
Product Dimensions 4 x 2.8 x 0.4 inches
Item Weight 4 ounces
Shipping Weight 14.4 ounces (View shipping rates and policies)
Manufacturer Seagate
ASIN B004MME0N0
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Item model number ST9750420AS
Customer Reviews
4.4 out of 5 stars 554 customer reviews

4.4 out of 5 stars
Best Sellers Rank #242 in Electronics > Computers & Accessories > Data Storage > Internal Hard Drives
Date first available at Amazon.com July 16, 2010

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Size: 750 GB Verified Purchase
Before I get into specifics, this caution - note the date and model on this (and other) Seagate internal hard drive reviews. Amazon lumps together drives of differing technology, size, and generation into one review pile. Look for the reviews that actually apply to the drive you're considering.

Even though I read multiple reviews warning that this 750GB drive is prone to failure, I'm an optimist so I bought one anyway. About two weeks later, my computer crashed with a BSOD (Blue Screen of Death) which turned out to be due to a bad sector that had developed in a critical system file. I ran a repair, got the machine working again, and two days later got another BSOD from more newly-developed bad sectors. The drive's built-in SMART diagnostic system is now predicting imminent drive failure. Given the number of people who have had similar experiences with this Seagate 750GB internal laptop product, one that has not been on the market that long, Seagate should stop selling it until they fix the problem.

If you're even more optimistic than I am and buy this drive anyway, be aware of another problem (albeit fixable) that nobody will tell you about in advance. This 750GB drive uses a new 4k sector size. Seagate advertises that they have built-in code that should make the sector size transparent to your system. While it seems to be true that the drive doesn't require you to install special software to accommodate its sector size, nevertheless your machine may require that you install an updated version of Intel's Matrix Storage Manager before the drive will function properly. You will get errors that don't tell you that this is the problem.
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Size: 750 GB Verified Purchase
I originally bought a Western Digital WD Scorpio Black 750 GB SATA 3 GB/s 7200 RPM 16 MB Cache Internal Bulk/OEM 2.5-Inch Mobile Hard Drive for use in my mid-2009 15-inch MacBook Pro (MacBookPro5,4). It had a major problem which I believe is due to a defect in the design of this version of the MacBook Pro. I replaced the Scorpio with a Seagate Momentus with comparable specs, and it has been working great.

The Seagate drives have an important feature which the Western Digital drives do not: a jumper which allows you to limit the speed of the SATA link to 1.5Gb/s. This turned out to be critical for me, since my version of the MacBook Pro apparently has problems with 3Gb/s drives. Lowering the transfer speed to 1.5Gb/s fixes everything. I'm probably reducing the performance of the drive slightly, but that's irrelevant, since the Scorpio at 3Gb/s was unusable to due the SATA link constantly resetting, each time freezing my computer for 30 seconds.
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Size: 750 GB Verified Purchase
Got this 720 GB HDD as an expansion hard drive for my Playstation 3 (fat model) and its been working great (installed for three weeks now.) No compatibility problems with upgrading from 5400 rpm to 7200 rpm. When I run the PS3 for hours I can hear the fan going louder to cool the system, but no overheating problems so far. Completely recommend it if you want a cheap upgrade.
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Size: 750 GB Verified Purchase
I needed a hard disk for my Sony Vaio laptop as I was getting cyclic redundancy check failures. I wanted a 1 TB hard disk (after all, I am spending the bucks, why not go for the trophy capacity) - but soon realized after some research that all 1 TB 2.5" hard disks in the market now are little thicker (taller) than most laptops have space for. Unless yours is a new laptop that can take a 12.5 mm thick hard disk, you have to stick to the standard 9.5 thick ones - which means you cannot get 1 TB, at least now. I am sure 6 months down the line, WD or Seagate or Samsung's gonna come up with a regular sized 1 TB disk. Anyway, I downgraded my capacity wish to 750 GB, and after some research, zeroed in on this one - reading some good favorable reviews on newegg and tigerdirect. I went with Amazon because of Amazon's great return policy (it is a hard disk to be shipped on a truck after all). Fit perfectly. Lots of space now, don't know what to do with it actually! Unless this one dies on me before its average life expectancy is over, I am going to stick to this 5 star review!
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By Raf on December 11, 2010
Size: 750 GB Verified Purchase
I used this HDD on my MacBook Pro instead of the original one. I expected it to be much faster as it's 7200RPM. But that's not the case.
Speed is ok while accessing data files, but it still takes some time when launching "heavy" applications.

My only problem now is trying to launch BootCamp on vmware Fusion (Win Vista on BootCamp runs great on its own). I still need to get that issue fixed!

I didn't notice any noise from the drive as I read in some reviews, so I believe it's quite enough for whoever works in the night when there's silence surrounding him like I do.

Great product and recommended for whoever is looking to expand his MBP's HDD.
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Size: 250 GB
If you own a laptop that is not operating up to your wishes, and you've already loaded up with RAM and defragmentated the hard drive, chances are that the performance deficit you are experiencing is simply the limitations of a 5400rpm drive, undoubtedly the type that came with your system. An easy (and now, inexpensive) way to significantly boost the speed of the system is simply to replace your 5400rpm drive with a faster, 7200rpm model. This used to be an expensive proposition, but now has become exceptionally affordable.

This particular Seagate model is especially good for upgrading an existing laptop for a number of reasons. First, as mentioned above, this is a 7200rpm drive, which all by itself offers a significant performance boost over the standard 5400rpm versions used in most all stock laptops. Second, the drive is a SATA 3.0Gb model, which means that the theoretical upper threshold for data transfer is exceptionally high (although in real life these values are almost never achieved). In addition, this particular model employs native command queuing, a hardware based performance feature which is not found on all such drives.

At about $60, this is one of the most effective and inexpensive ways to boost a laptop's overall performance. Don't expect miracles, but depending on the drive you are replacing, you may see quite a change in system responsiveness, particularly in disk intensive operations. The easiest way to perform the change is to use a disk imaging program to save a "snapshot" of the entire disk, remove the old disk , install the new drive, and then copy the saved image back to the new drive. Good luck!
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