Fujitsu Company takes part in our testing with its MHS series drive. “Our” model has the maximum possible capacity, 60GB (two platters and four heads). The family also includes hard disk drives of 20, 30 and 40GB storage capacities. The cache-buffer is ordinary, 2MB. The spindle rotation speed is 4200 rotations per minute. The HDD supports ATA-6 interface.
Unfortunately, Fujitsu is very laconic in describing its produce. From the information on the corporate website, I could only learn that the MHS family drives use platters with a data density of 53.2Gbit per square inch, giant magneto-resistive heads, synthetic ferromagnetic media and MEEPRML technology for channel reading. Besides, the drives use electric motors on fluid dynamic bearings that reduce the noise and increase the robustness. The algorithm for loading/unloading the heads helps to increase the drive’s reliability and robustness, too. The intelligent technology for controlling power consumption automatically adjusts the amount of consumed power.
Seagate Momentus ST94811A
Well, here is the cause for my writing this comparative review. Now we have the opportunity to compare this drive with other 2.5” HDDs. The capacity of our model is 40GB. It uses one 40GB platter and two heads. There exists a 20GB model with one platter, but one head only. The spindle rotation speed is 5,400rpm. The Momentus we test has a cache-buffer of 8MB, but there are models with a 2MB buffer. The supported interface is Ultra ATA/100.
The drive owes its great acoustic characteristics mostly to the SoftSonic motor with fluid dynamic bearings and a special technology called “QuietStep ramp load”. The latter serves a number of purposes. First of all, it diminishes the noise level. For example, it makes imperceptible the clicks occurring when the drive is loading/unloading the heads to/from the ramp. The acoustic characteristics are improved by flexible control over the speed of this process. Second, “QuietStep ramp load” increases the reliability of the hard disk by using an effective parking method. The heads in the Momentus drive are parked off the outer side of the platter rather than on the inside.
Seagate claims the new drive features enhanced power saving technologies. In particular, it is said to consume the same amount of power as slower, 4,200rpm devices.
The drive also features the exclusive 3D Defense technology. The three “D’s” are:
- Drive Defense is based on the combination of “QuietStep ramp load” and G-Force Protection technologies.
- Data Defense secures the data stored on the disk by using the error correction code on the fly, by returning the head to the same sector when the power is turned off (Safe Sparing) and by continuous background defect scanning (CBDS).
- The last “D”, Diagnostic Defense, consists of the diagnostic software called Sea Tools Suite, Web tools for solving technical problems over the Internet, the S.M.A.R.T. technology and the enhanced drive self-test (NDST).
Just like any other drive from Seagate, this one comes in a plastic case that protects against physical damage and electrostatic discharges.