Monday, June 27, 2011

Seagate Momentus 7200 500 GB 7200RPM SATA 3Gb/s 16MB Cache 2.5 Inch Internal NB Hard Drive ST9500420ASG-Bare Drive with G-Force Protection Review

Seagate Momentus 7200 500 GB 7200RPM SATA 3Gb/s 16MB Cache 2.5 Inch Internal NB Hard Drive ST9500420ASG-Bare Drive with G-Force Protection
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(More customer reviews)
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 (actually, the non G-sensing version, but they are otherwise exactly the same drive). Both failed offline SMART tests, so they have truly gone bad. When they were working, the drives were very fast and quiet, though, so I can certainly understand the high marks people give these drives when they first get them. However, after a month or so, the drives would start to have problems.
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 SMART data 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). Though if you REALLY want to do yourself a favor. Choose another brand.

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