Customer Review

152 of 170 people found the following review helpful
4.0 out of 5 stars high performance, 5 year warranty, self-rebuilding raid mirror, June 23, 2008
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This review is from: WD My Book Studio II - 2 TB (2 x 1 TB) USB 2.0/FireWire 800/eSATA Desktop External Hard Drive (Personal Computers)
If you want the best performance, you would want to use it as eSATA. This would mean a cardbus or expresscard eSATA adaptor on a laptop, for example. But here is the one star that I have taken off: at this price, it still does not come with an eSATA cable! It has cables for USB and the 1394, but no eSATA. I have not had the chance to test it in eSATA because of the cable. The USB2 speed is good enough for my archival application. I've also read around and eSATA is not faster than USB2 by much in real life (maybe 25MB/s vs 30MB/s).

The 5 year warranty is industry standard and is reassuring. And by the time it's up, you will want a larger storage anyway. :P But you must keep in mind that that if the controller in the enclosure dies, your whole array dies. Hopefully the controller didn't write bogus information into your harddrives and then hopefully WD will be able to ship you a new enclosure and you can recover that way. (This is the one weakness of having RAID 1 as the only copy. Be ware: a faulty controller can corrupt your data or even wipe your drives clean. Don't let that be your only copy.)

Cost-wise, each of its 1TB harddrives retails at about 180 as of this writing and you still need two enclosures to mount them externally. That means you are paying 470 - 2*180 = 110 for WD's own enclosure. It may still sound like a lot for an enclosure but the pros of this one outweight the cost and cons:

- The enclosure does RAID 1 (mirroring) in its hardware, no real cons here as long as 1TB+1TB mirroring is good enough for your application.

- Fanless: Less noise and it's really silent, but it also runs rather warm even with air conditioning. I do note that there is a temperature sensor that will stop the drives when overheated. So there is technically no worry, unless the temperature sensor itself dies... And being fanless is what makes the 5yr warranty even better. I've replaced one too many fans in my enclosures. (Many fans die within 3 years...)

- Self-rebuilds: After replacing a drive, it will rebuild in several hours. Good: completely automatic. Bad: it does this offline so the data is not accessible while rebuilding.

- Green assembly: I should note that you can only use WD's own "harddrive assembly" in this enclosure. You cannot (at least within the warranty's limit) use your own harddrives, not even WD Green Series retail ones since they do not come with the assembly hardware. See the manual if in doubt.

In all, highly recommended if the capacity suits your need.
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Showing 1-2 of 2 posts in this discussion
Initial post: Mar 7, 2009 5:10:45 AM PST
Last edited by the author on Mar 7, 2009 5:11:26 AM PST
J. Dlouhy says:
Your cost basis for the chassis is flawed. You can't use the drive's retail price to calculate a manufacturers cost. The expense to WD to produce/obtain the enclosure, power supply, cables, etc is probably $35 in volume. The rest is assembly, testing, shipping, marketing, packaging ... and PROFIT. Interesting to note the price as of March 2009 is $230, which is less than half the cost from just 9 months ago.

In reply to an earlier post on Mar 1, 2010 9:23:30 AM PST
S. Kane says:
The post author never claimed to estimate WD's manufacturing cost! He only estimated the retail (clearly noted: "...each of its 1TB harddrives retails at about 180...") enclosure cost that would enable you to approximate the same setup without exceeding the WD retail price.
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