Oh no, me too
This happened to me also, and I found this thread describing it (but too late).
Let me explain my "details"
Drive is an external USB 3TB USB3.0, "WD My Book Essential". It must be a few years old now, not sure how to see when it's from.
Formatted from the beginning with HFS Journaled (unencrypted), and I never used encryption (apart from sparse bundles on the disk, but those are just files anyway, not file system). I didn't install any WD files, unless they installed by themselves (they shouldn't be able to in Mac)
Yes, I have Maverick, 10.9.2 it says.
Just recently, I got this drive out as I needed to free some space on my MBP Retina (the one with Mavericks). It suddenly became quite slow, and when I investigated, I found I ran out of space on the external (yes, 3TB all full).
No wonder it was slow, my fault.
I did manage to delete some files, the drive cam back to life and I deleted some more, then finished using it and put it away (after having moved/sorted/deleted a lot of duplicate and now obsolete files)
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So I went to get a bigger drive, a new one, and behold, a nearly similar drive was the best option, so I got myself a "WD My Book", this time not called Essential or anything else.
Oh, had I only known, now I have TWO of these drives, the new one not even used yet. Is it worth using for anything related to data, or maybe just as a book shelf holder?
I used it once since then, and all seemed normal - until today.
Anyway, as of today, these are the symptoms:
I connect it, it shows in Finder, but when I click it, nothing comes up. Finder eventually HANGS, needs a restart, then takes ages to start, if at all. I cannot disconnect the drive, not even with terminal and FORCE. I made multiple attempts with DiskUtility "Repair", and an older version of StellarPhoenix (v3.5) didn't run properly, not in OSX 10.9.2 anyway. DiskUtility ends up almost every time with something about it cannot repair a drive in use (well, I DO want to unmount it, but I can't, so?)
So I mounted it on my older MBP (2008 vintage), sporting OSX 10.X (before Mavericks, I cannot see it right now, as even THAT hangs!). Finder won't restart, and Mac won't restart - might need a "hard" one here, ok here goes, hold down the power button.
OK, after hard shutdown now of the 2008 MBP, let's see what happens.
Until hanging, StellarPhoenix V3.5 on the 2008 MBP managed to run, it eventually stalled at "Reading sector 11196680 of 1565499392". "Stop Scanning" warned me it couldn't resume then, I clicked "YES", and the progress pattern went away - but it didn't stop scanning. When I tried to stop StellarPhoenix, it told me to stop scanning first - which I did, many times!
Drive still couldn't eject, Finder (in Mac OSX 10.7.5, now that it is up and running again) was not responding, so I forced quit it. Finder wouldn't restart, even after many minutes. Apple Logo was there, so I chose restart, got the spinning wheel for many minutes, finally gave up and held down the power button).
So what next?
Waiting for StellarPhoenix to come up with an offer to upgrade from v3.5 to v6.0 - maybe that will help?
In my case, the 3TB is a collection of previous many smaller drives, anything from 60GB to 500GB or so (2 1/2 USB powered externals). I should be able to get a lot of it back from these smaller drives, so I am not so unfortunate as many of the rest of you. I hope!
I do, however, believe I better open those old drives on my 2008 MBP, and copy from there to a new drive. Is it Mavericks, or is it WD - or both?
Are there any reliable and affordable external storage solutions, in the order of a few TB? I don't care if it's USB or Thunderbolt, except with Thunderbolt I would need a converter for my MBP2008 (or does it even work at all?)
In 2008, I went Windows to Mac, and had many years of almost trouble free use. This scenario now reminds me of the old Windows days, where tweaking, recovering, rebooting and reading threads like these was a regular "pasttime"