Thanks Christine, Godfrey and others for addressing my WD concern. I will 
continue to poke away at the problem. The RAID is only 1TB per platter, I am 
not sure it is worth it to buy an OWC enclosure for them. I do have an OWC 2TB 
RAiD, I might swap in the smaller drives just to see what happens…

Rick, it sounds like from Christine’s experience that you might not have an 
issue with your WD. If you have a nearby Apple store, could you go there, plug 
your drive into one of their systems and check compatibility that way before 
committing to the upgrade?
stan

> On Jun 2, 2015, at 11:57 AM, Christine Aguila <[email protected]> wrote:
> 
> Hi Rick:
> 
> I have Yosemite on my iMac and MacBook Pro/Retina and so far no problems at 
> all.  I currently use WD Passport external drives for photos with the iMac 
> and MBPR, and just the other day I plugged in two much older WD 
> externals—forget the name—I think My Book or something, anyway, they are the 
> much bigger chunky externals, and I was able to read and import files from 
> them. Both are completely full and duplicate my current working external 
> drives, so I designated them as off-premise drives for the time being.
> 
> I had to purchase Office for the laptop because so many folks at work use it, 
> and it just makes work life easier despite my strong preference for Pages, 
> Numbers, and Keynote.  Office runs just fine on the laptop with Yosemite.
> 
> I have Lightroom 6 on both the lap & desktop, with the desktop running a 
> little slower than the laptop, but the desktop has half the RAM of the laptop.
> 
> Based on my experience, I would recommend the Yosemite upgrade if your 
> hardware can run it, but I’d really make sure all your medical applications 
> will run well on Yosemite, and it would, obviously, be tough for me to speak 
> to that.
> 
> Cheers, Christine
> 
> 
> 
> 
>> On Jun 2, 2015, at 9:48 AM, Rick Womer <[email protected]> wrote:
>> 
>> Thanks, everyone.
>> 
>> Darren, that is a very interesting link.
>> 
>> Stan, the only WD drive hooked up to the MBP is a portable drive I
>> keep a CCC backup on. OTOH my Mac Mini at home (my photo computer) has
>> an external WD MyBook that holds all of my pix (backed up to an OWC
>> drive with Time Machine).
>> 
>> Still pondering…
>> 
>> Rick
>> http://photo.net/photos/RickW
>> 
>> 
>> On Tue, Jun 2, 2015 at 10:20 AM, Godfrey DiGiorgi
>> <[email protected]> wrote:
>>> Stan,
>>> 
>>> I had a couple of WD RAID drives. The enclosures were crap, one failed 
>>> within three months, the other ran but the configuration software wouldn't. 
>>> I wouldn't blame OS X for their junk. I ripped all the drives out of those 
>>> enclosures, tossed the enclosures, and put the drives into 
>>> OtherWorldComputing's "Mercury Elite" enclosures—that was in 2008, the 
>>> drives are still working beautifully today, with all my systems running 
>>> Yosemite. WD produces good drives and crap enclosures and software, far as 
>>> I'm concerned. LaCie is much more robust on the software and enclosure side 
>>> of the fence.
>>> 
>>> —
>>> Otherwise …
>>> 
>>> I stay up to date on operating system and application software for all my 
>>> devices. Always. That way, I'm never making big jumps from ancient to 
>>> current, and everything tends to work more smoothly. I might update one 
>>> device and test it first before putting new releases onto my primary work 
>>> machine, but the testing has rarely shown me a reason to hold off. PowerPC 
>>> software is antique now … I deleted all of it when Snow Leopard came out 
>>> and replaced it with newer, more modern, better functioning current 
>>> software.
>>> 
>>> The new look and feel of Yosemite was a little jarring at first, but eh? 
>>> I've seen hundreds of variations on the these of OS UI since 1984. I always 
>>> reserve judgement on anything new in UI look and feel for a month or two. I 
>>> find that, for the most part, within a week and I can hardly remember what 
>>> the old stuff looked like—and moreover, usually forget how to operate the 
>>> old stuff nearly as fast. I concentrate my critique on things that don't 
>>> function well, and file bugs with Apple (and third party companies) 
>>> regularly. I've found that what I file as bugs is usually fixed within one 
>>> or two dot-dot releases.
>>> 
>>> I've had good experience with Yosemite, and by-and-large the industry 
>>> reports of end-user problems have show the lowest bug count of the past 
>>> four OS X releases. All of my work and personal Macs are running it (that's 
>>> three laptops, two desktops, with the oldest machines being late-2010 
>>> issue) without any problems.
>>> 
>>> What suits a particular person's needs, however, I cannot say for sure 
>>> without lots more information about required use, required software, and 
>>> the ability to obtain updated and more compatible software if there are 
>>> incompatibilities. Advising on such things is a business of relevant detail 
>>> information, not general suggestions.
>>> 
>>> G
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