IMac crashes when powering off external Thunderbolt drive

Hi,
I have an external LaCie d2 USB 3.0 drive that is connect to my iMac (27-inch, Mid 2011, 3,1 GHz Intel Core i5, 12 GB RAM) through Thunderbolt. Whenever I power off the drive by pushing the power button (yes I did verify: all partitions have been ejected correctly before in the Finder and verified in Disk Utility), the iMac crashes. It starts up again, displays a screen stating the computer was not shut down properly and then immediately restarts. After that it boots up fine.
This started occurring after having installed 10.10.2 Beta. I did file a report with Apple. As this was beta software I decided to completely reinstall the iMac from scratch (a complete fresh install, just imported my documents manually after) and everything was working fine again (10.10.1). Boom, after having updated 10.10.2 yesterday the problem is back.
I did manage to find a workaround: when I connect the drive through a UBS cable it works fine. Conclusion: this seems to be caused by a Thunderbolt related update in 10.10.2.
Question: is any one else with an external Thunderbolt drive experiencing this and has perhaps found a fix?
Thanks,
Kurt
Wed Jan 28 16:30:36 2015
*** Panic Report ***
panic(cpu 0 caller 0xffffff800341a46e): Kernel trap at 0xffffff80038e9774, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000000, CR3: 0x00000000066ee000, CR4: 0x00000000000626e0
RAX: 0x0000000000070001, RBX: 0xffffff8036919c00, RCX: 0x8883c87675b70011, RDX: 0xffffff81541e9088
RSP: 0xffffff817bb0be90, RBP: 0xffffff817bb0be90, RSI: 0xffffff81541e9068, RDI: 0x0000000000000000
R8: 0x0000000000987482, R9: 0xffffff8003a95740, R10: 0x000017d7912af429, R11: 0x000017d790927fa7
R12: 0xffffff817bb0bf50, R13: 0xffffff7f85328044, R14: 0xffffff7f8533e978, R15: 0xffffff8003ad66c0
RFL: 0x0000000000010202, RIP: 0xffffff80038e9774, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000000000000, Error code: 0x0000000000000000, Fault CPU: 0x0
Backtrace (CPU 0), Frame : Return Address
0xffffff817bb0bb40 : 0xffffff800332fe41
0xffffff817bb0bbc0 : 0xffffff800341a46e
0xffffff817bb0bd80 : 0xffffff8003436683
0xffffff817bb0bda0 : 0xffffff80038e9774
0xffffff817bb0be90 : 0xffffff7f85328267
0xffffff817bb0beb0 : 0xffffff7f8532bad7
0xffffff817bb0bee0 : 0xffffff7f853281ed
0xffffff817bb0bf00 : 0xffffff80033624f9
0xffffff817bb0bfb0 : 0xffffff8003414dd7
      Kernel Extensions in backtrace:
         com.apple.driver.AppleAHCIPort(3.1)[93E1D2EC-50EE-3340-9676-0EA1E0B1AD45]@0xfff fff7f85324000->0xffffff7f8533efff
            dependency: com.apple.iokit.IOAHCIFamily(2.7.5)[DAF0353B-16D5-385A-A0F3-FD5CF3BA07F2]@0xfff fff7f84706000
            dependency: com.apple.iokit.IOPCIFamily(2.9)[56AD16B5-4F29-3F74-93E7-D492B3966DE2]@0xffffff 7f83b24000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
14C109
Kernel version:
Darwin Kernel Version 14.1.0: Mon Dec 22 23:10:38 PST 2014; root:xnu-2782.10.72~2/RELEASE_X86_64
Kernel UUID: DCF5C2D5-16AE-37F5-B2BE-ED127048DFF5
Kernel slide:     0x0000000003000000
Kernel text base: 0xffffff8003200000
__HIB text base: 0xffffff8003100000
System model name: iMac12,2

Same issue:
- 4TB LaCie d2 Thunderbolt & USB3.0 drive (model # 9000303)
- iMac (27’’ mid-2011), Thunderbolt firmware version 25,1 and Port Micro firmware version 2.1.3 (as seen in System Information)
- OS X Yosemite 10.10.2
Unmounting LaCie d2 disk partitions is OK: the drive spins down and goes to sleep without problem. However when I take the power off (with the small switch at the rear of the unit), the iMac experiences a kernel panic.
This issue did not occur with Yosemite 10.10.1, and does not occur either with another LaCie drive (8TB LaCie 2big Thunderbolt drive, model # 9000246). So the issue is specific to OS X 10.10.2, and only certain models of drive(s).
We need a fix from Apple - the Operating System should be rock-solid in any circumstances.
Curiously, OS X does not write a kernel panic log with every occurrence. It’s only after the 3rd or 4th kernel panic that it would actually produce this log:
===============
Sat Jan 31 15:57:30 2015
*** Panic Report ***
panic(cpu 0 caller 0xffffff802241a46e): Kernel trap at 0xffffff80228e9774, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000000, CR3: 0x000000002565b000, CR4: 0x00000000000626e0
RAX: 0x0000000000070001, RBX: 0xffffff804e6e9000, RCX: 0xcb694f8798fc00ec, RDX: 0xffffff81e115d088
RSP: 0xffffff820d1f3e90, RBP: 0xffffff820d1f3e90, RSI: 0xffffff81e115d068, RDI: 0x0000000000000000
R8: 0x0000000000987939, R9: 0xffffff81e115d068, R10: 0x0000031b3cf5cc6a, R11: 0x0000031b3c5d5331
R12: 0xffffff820d1f3f50, R13: 0xffffff7fa4295044, R14: 0xffffff7fa42ab978, R15: 0xffffff8022ad66c0
RFL: 0x0000000000010202, RIP: 0xffffff80228e9774, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000000000000, Error code: 0x0000000000000000, Fault CPU: 0x0
Backtrace (CPU 0), Frame : Return Address
0xffffff820d1f3b40 : 0xffffff802232fe41
0xffffff820d1f3bc0 : 0xffffff802241a46e
0xffffff820d1f3d80 : 0xffffff8022436683
0xffffff820d1f3da0 : 0xffffff80228e9774
0xffffff820d1f3e90 : 0xffffff7fa4295267
0xffffff820d1f3eb0 : 0xffffff7fa4298ad7
0xffffff820d1f3ee0 : 0xffffff7fa42951ed
0xffffff820d1f3f00 : 0xffffff80223624f9
0xffffff820d1f3fb0 : 0xffffff8022414dd7
      Kernel Extensions in backtrace:
         com.apple.driver.AppleAHCIPort(3.1)[93E1D2EC-50EE-3340-9676-0EA1E0B1AD45]@0xfff fff7fa4291000->0xffffff7fa42abfff
            dependency: com.apple.iokit.IOAHCIFamily(2.7.5)[DAF0353B-16D5-385A-A0F3-FD5CF3BA07F2]@0xfff fff7fa365a000
            dependency: com.apple.iokit.IOPCIFamily(2.9)[56AD16B5-4F29-3F74-93E7-D492B3966DE2]@0xffffff 7fa2b24000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
14C109
Kernel version:
Darwin Kernel Version 14.1.0: Mon Dec 22 23:10:38 PST 2014; root:xnu-2782.10.72~2/RELEASE_X86_64
Kernel UUID: DCF5C2D5-16AE-37F5-B2BE-ED127048DFF5
Kernel slide:     0x0000000022000000
Kernel text base: 0xffffff8022200000
__HIB text base: 0xffffff8022100000
System model name: iMac12,2 (Mac-942B59F58194171B)

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0xffffff8084698ea0 : 0xffffff80100f3746
0xffffff8084698ec0 : 0xffffff801005248e
0xffffff80abb23cd0 : 0xffffff8010051dc9
0xffffff80abb23dd0 : 0xffffff7f909ef726
0xffffff80abb23e50 : 0xffffff7f909ef15c
0xffffff80abb23ed0 : 0xffffff7f909eee0b
0xffffff80abb23f20 : 0xffffff80104353b5
0xffffff80abb23f50 : 0xffffff8010440a33
0xffffff80abb23fb0 : 0xffffff80100f3f46
      Kernel Extensions in backtrace:
         com.apple.kec.pthread(1.0)[882075E6-12C4-3225-8750-928715183739]@0xffffff7f909e a000->0xffffff7f909f4fff
BSD process name corresponding to current thread: ReportCrash
Mac OS version:
13E28
Kernel version:
Darwin Kernel Version 13.3.0: Tue Jun 3 21:27:35 PDT 2014; root:xnu-2422.110.17~1/RELEASE_X86_64
Kernel UUID: BBFADD17-672B-35A2-9B7F-E4B12213E4B8
Kernel slide:     0x000000000fe00000
Kernel text base: 0xffffff8010000000
System model name: iMac12,2 (Mac-942B59F58194171B)

Both Memory Clean and Clean My Mac could have cause the damage which triggered the kp.
I would back up your Mac, erase and reinstall. Then Migrate your user data from the backup.
Uninstalling Tuxera is a troubleshooting process. You don't have to keep it uinstalled, just long enough to test to see if it is causing the problems.
However, if it doesn't happen regularly, it would be hard to determine if it was the cause. And, as I mentioned, I don't think it would be the cause.

Can a computer crash disable (break) an external hard drive?

Can a computer crash disable (break) an external hard drive (FW800)?
My mac pro started to see programs crash. First one, that wouldn't 'force quit', then a minute later a second. This had happened before last year, so i started quitting apps to restart. At the end, half of them i succeeded to quit and about 4 wouldn't quit. The finder was frozen/crashed, no dock or apple menu or any menu for that matter. The mouse moved. i could shortcut 'force quit' and 'return' on default OKs.
So i powerbuttoned down. On rebooting, the volumes on the Mercury Elite* unit in question didn't mount. I looked for them with disk utility but nothing. So i then examined the unit. A soft clicking noise was emanating and the power adapter was HOT!
The two drives are now in the mac pro internally and are working fine. But before i took them out, i tested the pins on the power adapter with a voltmeter, according to the schematic on the adapter itself and i got 5,5v on the one side and 13 odd v on the other. Apparently what's supposed to be coming out. (5v and 12v)
Can a powerbutton shutdown shoot electricity through the FireWIre bus? Any ideas?
http://eshop.macsales.com/item/Other%20World%20Computing/MEFW924AL2K/

Can a computer crash disable (break) an external hard drive (FW800)?
No, but it could damage files or the directory structure, so the drive wouldn't mount. Disk Utility should be able to fix it by erasing or partitioning, but you would lose the data on the drive.
My mac pro started to see programs crash. First one, that wouldn't 'force quit', then a minute later a second. This had happened before last year, so i started quitting apps to restart. At the end, half of them i succeeded to quit and about 4 wouldn't quit. The finder was frozen/crashed, no dock or apple menu or any menu for that matter. The mouse moved. i could shortcut 'force quit' and 'return' on default OKs.
You may have bad RAM, or other hardware problems. Have you run the extended Apple Hardware Tests. Boot from the install DVD while pressing "D". Try removing any non-Apple RAM modules.
I tested the pins on the power adapter with a voltmeter, according to the schematic on the adapter itself and i got 5.5 V on the one side and 13 odd V on the other. Apparently what's supposed to be coming out. (5 V and 12 V)
Some power supplies will put out more than the rated voltage if there is nothing attached, but 5.5 V and 13 V are not high enough to cause damage, anyway.
Can a powerbutton shutdown shoot electricity through the FireWIre bus?
No.

HT6114 Air and iMac crash when trying to upgrade to Mavericks from Lion.

Air and iMac crash when trying to upgrade to Mavericks from Lion.

Make sure your Macs can run Mavericks > OS X Mavericks: System Requirements
The v10.9.2 link you posted from is not an upgrade. It's an update for Mavericks only.

IMac crashes when powering off external Thunderbolt drive

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