Product Description

WD's My Book Studio Edition II dual-drive, quad-interface external storage system for Mac offers optimum performance for creative professionals. Lightning-fast FireWire 800 or eSATA interfaces combined with RAID 0 (striping) yields the speed you need for fast, smooth video and audio editing, rendering complex 3D objects or special effects, and saving huge blocks of data in record time. Set the system to RAID 1 (mirroring) for the peace of mind in knowing that if one drive in this two-drive system ever fails, the system continues to run and your data is safe. Includes automatic data backup software, user-serviceability, a 5-year limited warranty, and works with Apple's Time Machine.

Product Details

• Amazon Sales Rank: #1438 in Consumer Electronics
• Size: 4 TB
• Color: Silver
• Brand: Western Digital
• Model: WDH2Q40000N
• Format: CD
• Original language: English
• Dimensions: 8.60" h x 8.63" w x 7.63" l, 7.39 pounds
• Hard Disk: 4TB

Features

• Performance for creative pros; Quad interface
• Formatted for Mac; RAID 1/0
• 33% power reduction

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Customer Reviews

WD admits there is a firewire "technical limitation."
I have been using the WD Studio II 2TB on my 2008 iMac OSX 10.5.6 for two weeks. Connection: firewire 800. Today, it did not mount when I booted the computer.
Checked the WD Website Knowledge Base.

Discovered two things:

1. Knowledge Base Answer 1697: "This issue is caused by the external hard drive's built in auto on/off functionality not correctly receiving a command from the computer system to wake from a power saver mode."

Why does the auto on/off functionality not correctly receive the command from the computer system? WD goes on to suggest installing their WD Drive Manager.
Well, WD Drive Manager is already installed, how else could a user have arrived at this impasse to begin with?
And then they suggest to dismount the drive. How do you dismount an unmounted drive?

2. Knowledge Base Answer 1680: "This is an technical limitation between the FireWire interfaces on the Macintosh computer and the external hard drive."

By "the external hard drive" WD means THEIR brand of external hard drive. I have never had this specific problem with any other brands of external hard drives connected to my Macintosh computer.
When is WD going to fix this "technical limitation" that they have built into their Studio II external hard drive? I would say, that is a pretty serious "technical limitation."
1680 goes on to explain the workaround solution, essentially a routine disconnecting the power cable and reconnecting. Nice.

My hope is that this entire situation is the result of following the apparently misleading instructions shown in the Studio II manual: chapter 7, "Turning Off/Disconnecting the Device."
Since "Auto-off" is the first entry in this chapter, it leads the user to believe that this is the preferred way to operate the drive. Guess not: as it turns out, the hidden "technical limitation" of the firewire connection will eventually cause the problem I have described. I suppose I can't rely on "Auto-off." Use "Safe Shutdown" only, even though the instructions in the manual differ from the instructions presented in WD Knowledge Base Answer 976!
And, speaking of conflicting instructions, compare WD Knowledge Base Answer 1386 with the Auto-off instructions in the manual.

Based on all of this information from WD, conflicting and otherwise, my guess is that the Auto-off feature is problematic (at least with Macintosh computers) because of firewire "technical limitations" caused by the WD external drive design. This fact, if it is a fact, should be expressed clearly in the manual.

high performance, 5 year warranty, self-rebuilding raid mirror
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.

So far so good, except runs HOT
I thought this drive would finally release me from my worry that my backups will melt away before my eyes. The Greenpower concept seems well and good but I don't know about the long term viability of putting two of these drives in the same tiny enclosure with no active cooling.

After about 20 minutes of transfers I opened the lid and the drives burned my hand. I put a digital thermometer on the inside of the case between the hard drives and the air in there was 51C. The drives were probably between 60-70C as I can't be sure. Compared to my internal WD Caviar 500GB drive that runs at 32C when cooled by the case-fan the the My Book worries me. Not that I will be running the drives for 2 hrs at a time all the time but it happens.

Otherwise, I tested the RAID 1 feature by removing a drive while the unit was powered and when I replaced it, the rebuilding process automatically began. If I unplugged it during the rebuilding, it would resume when I plugged it in again. Again after only 15-30 minutes of rebuilding the drives were too hot to touch again. I can't imagine how hot the non-Greenpower drives get.

The power consumption ranges from 4W when off to 16W when rebuilding.

The interface is quite speedy as well. Roughly writing at 35MB/s using USB2.0.

I think I'm going to return the drive and build a NAS with two of the same drives inside for peace of mind.