Seagate Momentus 750GB Notebook Hard Drive ST9750420AS Review

Filed under: Hard Drives,Reviews |

So, after a few days off I’ve got that last hard drive review for you, at least for a while anyway. The drive is the Seagate Momentus 750gb, model ST9750420AS notebook drive.


Product Name: Momentus 750GB Notebook Hard Drive

Author: Kristofer Brozio

Provider:  Seagate

Price: $94.99 (from Amazon at time of review)

The Seagate Momentus drive delivers the highest available capacity and performance in a laptop hard drive and draw only .05 percent more power than a 5400-RPM laptop drive

The Momentus family of 2.5-inch laptop drives offers innovative options and features, such as capacity up to 750GB, two different performance speeds, and three significant features.

Key Features and Benefits:
-Seagate SmartAlign technology provides a transition to 4K sectors without the need for software utilities.
-Seagate Self-Encrypting Drives deliver government-grade encryption without performance degradation—protecting your data where it lives. The FIPS 140-2 options are NIST government-certified for both U.S. and Canadian usage with sensitive data.
-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.

Model Number: ST9750420AS
Interface:    SATA 3Gb/s
Cache: 16MB
Capacity: 750GB
Areal density (avg): 541Gb/in2
Guaranteed Sectors: 1,465,149,168

Height: 9.5mm (0.370 in)
Width: 69.85mm (2.750 in)
Length: 100.35mm (3.951 in)
Weight (typical): 115g (0.254 lb)

Spin Speed (RPM): 7200 RPM
Average latency: 4.2ms
Random read seek time: 11.0ms
Random write seek time: 13.0ms
I/O data transfer rate: 300MB/s

The Review::

So it’s another hard drive for a laptop of notebook.



Ok, so let’s get into the testing:


sea4 momentus 750gb atto seagate lp atto momentus 500gb atto attosamhm500ji atto wdbevs

Barracuda 7200.12: 133 MB/s Write and 134 MB/s Read

Momentus 750GB: 119 MB/s Write and 121 MB/s Read

Barracuda LP: 102 MB/s Write and 101 MB/s Read

Momentus 7200.4: 92 MB/s Write and 104 MB/s Read

Samsung HM500JI: 78 MB/s Write and 79 MB/s Read

Western Digital:  55 MB/s Write and 55 MB/s Read

I wasn’t expecting this little drive to be as fast as it is.


Next up would be Crystal DiskMark:

sea7 momentus 750gb crystaldiskmark momentus 500gb crystaldiskmark crystakmark seagate lp diskmarksamhm500ji wdbevs crystaldisk

This is ordered by read rates, the Momentus performs just as well in this test. Not bad at all.


File Systems

Benchmark mounted file systems (i.e. volumes).

This is not the raw disk performance that other benchmarks test – but the speed of the volume itself that depends on many more factors like file system, operating system cache, position on disk, etc. Thus this is the performance you get at the file system level.

Drive Score: is a composite figure representing an overall performance rating based on the average of the read, write, and seek tests, and file and cache size. It is intended to represent drive performance under typical use in a PC


No surprises here at all, the Momentus still has a good showing.


Physical Disks

Benchmark hard disks (i.e. the disk itself, not the file system).

As the test measures raw performance it is independent on the file system the disk uses and any volumes mounted off the disk.

Drive Score: is a composite figure representing an overall performance rating based on the highest read or write speed across the whole disk. Thus the higher the better.

Access Time: is the average time to read a random sector on the disk, analogous to latency response time. Thus the lower the better


The score of the Momentus  looks good I think with the Random Access time being the lowest of all.


It seems this little hard drive easily compares to the larger 3.5” drives, the performance is just excellent overall.

The drive stays cool under load, which is what you want for a notebook drive of course.



+Excellent performance
+Stays cool under load
+Fast random access time
-None really


10 out of 10

Overall: score-10-10
Aesthetic: score-10-10
Value / Price: score-10-10
Build Quality: score-10-10
Usability: score-10-10

Disclosure:This product was given to Review the Tech for review by the company for review purposes only, and is not considered by us as payment for the review, we do not, and never will, accept payment from companies to review their products. This product may have also been bought by us for review purposes and does not influence the review.