External USB 2.0 hard drive reconnects on its own after power-down

I have an external USB 2.0 hard drive which I'm trying to power off (after unmounting all partitions, of course) using:
$ udisksctl power-off --block-device /dev/sdb
When I do this, the drive spins back up after a few seconds. Only when I issue the same command again does the drive stay powered off.
I'm running:
linux 3.13.7-1
udisks2 2.1.3-1
This is what I see in the journal log when I:
- Plug in the drive's USB cable
- Issue the power-off command
- After the drive spins up again, issue the command again
Mar 29 19:51:01 miki-desktop kernel: usb 1-5: new high-speed USB device number 10 using ehci-pci
Mar 29 19:51:01 miki-desktop kernel: usb-storage 1-5:1.0: USB Mass Storage device detected
Mar 29 19:51:01 miki-desktop kernel: usb-storage 1-5:1.0: Quirks match for vid 1058 pid 0704: 8000
Mar 29 19:51:01 miki-desktop kernel: scsi12 : usb-storage 1-5:1.0
Mar 29 19:51:01 miki-desktop mtp-probe[21301]: checking bus 1, device 10: "/sys/devices/pci0000:00/0000:00:04.1/usb1/1-5"
Mar 29 19:51:01 miki-desktop mtp-probe[21301]: bus: 1, device: 10 was not an MTP device
Mar 29 19:51:02 miki-desktop kernel: scsi 12:0:0:0: Direct-Access WD 5000BMV External 1.75 PQ: 0 ANSI: 4
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] Write Protect is off
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] Mode Sense: 23 00 00 00
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] No Caching mode page found
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] Assuming drive cache: write through
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] No Caching mode page found
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] Assuming drive cache: write through
Mar 29 19:51:02 miki-desktop kernel: sdb: sdb1 sdb2
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] No Caching mode page found
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] Assuming drive cache: write through
Mar 29 19:51:02 miki-desktop kernel: sd 12:0:0:0: [sdb] Attached SCSI disk
Mar 29 19:51:47 miki-desktop udisksd[21107]: Powering off /dev/sdb - successfully sent SCSI command START STOP UNIT
Mar 29 19:51:47 miki-desktop udisksd[21107]: Powered off /dev/sdb - successfully wrote to sysfs path /sys/devices/pci0000:00/0000:00:04.1/usb1/1-5/remove
Mar 29 19:51:47 miki-desktop kernel: usb 1-5: USB disconnect, device number 10
Mar 29 19:51:47 miki-desktop kernel: usb 2-5: new full-speed USB device number 9 using ohci-pci
Mar 29 19:51:48 miki-desktop kernel: usb 2-5: not running at top speed; connect to a high speed hub
Mar 29 19:51:48 miki-desktop kernel: usb-storage 2-5:1.0: USB Mass Storage device detected
Mar 29 19:51:48 miki-desktop kernel: usb-storage 2-5:1.0: Quirks match for vid 1058 pid 0704: 8000
Mar 29 19:51:48 miki-desktop kernel: scsi13 : usb-storage 2-5:1.0
Mar 29 19:51:48 miki-desktop mtp-probe[21555]: checking bus 2, device 9: "/sys/devices/pci0000:00/0000:00:04.0/usb2/2-5"
Mar 29 19:51:48 miki-desktop mtp-probe[21555]: bus: 2, device: 9 was not an MTP device
Mar 29 19:51:49 miki-desktop kernel: scsi 13:0:0:0: Direct-Access WD 5000BMV External 1.75 PQ: 0 ANSI: 4
Mar 29 19:51:49 miki-desktop kernel: sd 13:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
Mar 29 19:51:49 miki-desktop kernel: sd 13:0:0:0: [sdb] Write Protect is off
Mar 29 19:51:49 miki-desktop kernel: sd 13:0:0:0: [sdb] Mode Sense: 23 00 00 00
Mar 29 19:51:49 miki-desktop kernel: sd 13:0:0:0: [sdb] No Caching mode page found
Mar 29 19:51:49 miki-desktop kernel: sd 13:0:0:0: [sdb] Assuming drive cache: write through
Mar 29 19:51:49 miki-desktop kernel: sd 13:0:0:0: [sdb] No Caching mode page found
Mar 29 19:51:49 miki-desktop kernel: sd 13:0:0:0: [sdb] Assuming drive cache: write through
Mar 29 19:51:52 miki-desktop kernel: sdb: sdb1 sdb2
Mar 29 19:51:52 miki-desktop kernel: sd 13:0:0:0: [sdb] No Caching mode page found
Mar 29 19:51:52 miki-desktop kernel: sd 13:0:0:0: [sdb] Assuming drive cache: write through
Mar 29 19:51:52 miki-desktop kernel: sd 13:0:0:0: [sdb] Attached SCSI disk
Mar 29 19:52:20 miki-desktop udisksd[21107]: Powering off /dev/sdb - successfully sent SCSI command START STOP UNIT
Mar 29 19:52:20 miki-desktop udisksd[21107]: Powered off /dev/sdb - successfully wrote to sysfs path /sys/devices/pci0000:00/0000:00:04.0/usb2/2-5/remove
Mar 29 19:52:20 miki-desktop kernel: usb 2-5: USB disconnect, device number 9
What is interesting is that on first connect, the drive is using ehci-pci driver, then after the first try powering it off, the drive appears to reconnect using the ohci-pci driver. Not just that, it appears to 'jump' from one USB bus to another. How is this even possible?
$ lspci
00:00.0 Host bridge: NVIDIA Corporation MCP73 Host Bridge (rev a2)
00:00.1 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a2)
00:01.0 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a1)
00:01.1 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a1)
00:01.2 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a1)
00:01.3 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a1)
00:01.4 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a1)
00:01.5 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a1)
00:01.6 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a1)
00:02.0 RAM memory: NVIDIA Corporation nForce 630i memory controller (rev a1)
00:03.0 ISA bridge: NVIDIA Corporation MCP73 LPC Bridge (rev a2)
00:03.1 SMBus: NVIDIA Corporation MCP73 SMBus (rev a1)
00:03.2 RAM memory: NVIDIA Corporation MCP73 Memory Controller (rev a1)
00:03.3 Co-processor: NVIDIA Corporation MCP73 Co-processor (rev a2)
00:03.4 RAM memory: NVIDIA Corporation MCP73 Memory Controller (rev a1)
00:04.0 USB controller: NVIDIA Corporation GeForce 7100/nForce 630i USB (rev a1)
00:04.1 USB controller: NVIDIA Corporation MCP73 [nForce 630i] USB 2.0 Controller (EHCI) (rev a1)
00:0a.0 PCI bridge: NVIDIA Corporation MCP73 PCI Express bridge (rev a1)
00:0b.0 PCI bridge: NVIDIA Corporation MCP73 PCI Express bridge (rev a1)
00:0c.0 PCI bridge: NVIDIA Corporation MCP73 PCI Express bridge (rev a1)
00:0d.0 PCI bridge: NVIDIA Corporation MCP73 PCI Express bridge (rev a1)
00:0e.0 IDE interface: NVIDIA Corporation MCP73 IDE (rev a2)
00:0f.0 Ethernet controller: NVIDIA Corporation MCP73 Ethernet (rev a2)
01:06.0 Multimedia audio controller: C-Media Electronics Inc CMI8738/CMI8768 PCI Audio (rev 10)
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV710 [Radeon HD 4550]
02:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] RV710/730 HDMI Audio [Radeon HD 4000 series]
$ lsusb
Bus 001 Device 009: ID 1058:0704 Western Digital Technologies, Inc. Passport External HDD
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 007: ID 15ca:0101 Textech International Ltd. MIDI Interface cable
Bus 002 Device 003: ID 04d9:1603 Holtek Semiconductor, Inc. Keyboard
Bus 002 Device 002: ID 046d:c001 Logitech, Inc. N48/M-BB48 [FirstMouse Plus]
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Before the first power-off attempt:
$ lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-pci/10p, 12M
|__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 2: Dev 3, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 4: Dev 7, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 7, If 1, Class=Audio, Driver=snd-usb-audio, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/10p, 480M
|__ Port 5: Dev 9, If 0, Class=Mass Storage, Driver=usb-storage, 480M
After the first power-off attempt:
$ lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-pci/10p, 12M
|__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 2: Dev 3, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 4: Dev 7, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 7, If 1, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 5: Dev 10, If 0, Class=Mass Storage, Driver=usb-storage, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/10p, 480M
Does anyone know how to fix this problem? Is it a device quirk, a driver bug or something?
Last edited by ackalker (2014-03-29 19:21:04)

Just to be sure, I rebooted my system, shut down lightdm from another VT, made sure that really nothing is using the drive, no partitions are mounted, no services that could try to use the drive (except udisks2.service, could this one be the problem? But how am I supposed to use the udisksctl command when the service isn't running?).
Tried the same command again. same result: I needed to run it twice in a row for it to 'take'.
What I find even more fascinating: how can a USB device jump from one USB bus to another like that? I've honestly never seen anything like this before :-)
Last edited by ackalker (2014-03-29 19:35:29)

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when the hard drive is connected to the usb 3.0 port, the drive could not be found.
the dmesg output is listed below.
additinal info:
1) the usb 3.0 hard drive can be found when connected to usb 2.0 port.
2) the usb 2.0 hard drive can be found when connected to usb 3.0 port.
3) mouse works when connected to the usb 3.0 port.
it seems that it is not the linux driver's problem, because the mouse could work and the hard drive is found due to the dmesg.
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dmesg out put when usb 3.0 hard drive is conneted to usb 3.0 port:
[ 646.077385] usb 2-2: new SuperSpeed USB device number 2 using xhci_hcd
[ 646.171319] usbcore: registered new interface driver uas
[ 646.175313] Initializing USB Mass Storage driver...
[ 646.175501] scsi4 : usb-storage 2-2:1.0
[ 646.175665] usbcore: registered new interface driver usb-storage
[ 646.175667] USB Mass Storage support registered.
[ 657.149403] scsi 4:0:0:0: Direct-Access WD My Passport 0730 1016 PQ: 0 ANSI: 6
[ 657.149974] sd 4:0:0:0: [sdb] 976707584 512-byte logical blocks: (500 GB/465 GiB)
[ 657.150223] sd 4:0:0:0: [sdb] Write Protect is off
[ 657.150232] sd 4:0:0:0: [sdb] Mode Sense: 47 00 10 08
[ 657.150456] sd 4:0:0:0: [sdb] No Caching mode page present
[ 657.150462] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 657.151436] sd 4:0:0:0: [sdb] No Caching mode page present
[ 657.151440] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 657.159907] sdb: sdb1
[ 657.160852] sd 4:0:0:0: [sdb] No Caching mode page present
[ 657.160858] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 657.160861] sd 4:0:0:0: [sdb] Attached SCSI disk
[ 657.268875] usb 2-2: Device not responding to set address.
[ 657.471456] usb 2-2: Device not responding to set address.
[ 657.674211] usb 2-2: device not accepting address 2, error -71
[ 657.780745] usb 2-2: Device not responding to set address.
[ 657.983519] usb 2-2: Device not responding to set address.
[ 658.186214] usb 2-2: device not accepting address 2, error -71
[ 658.292717] usb 2-2: Device not responding to set address.
[ 658.495537] usb 2-2: Device not responding to set address.
[ 658.698277] usb 2-2: device not accepting address 2, error -71
[ 658.804774] usb 2-2: Device not responding to set address.
[ 659.007557] usb 2-2: Device not responding to set address.
[ 659.210298] usb 2-2: device not accepting address 2, error -71
[ 659.210366] usb 2-2: USB disconnect, device number 2
[ 659.213797] sd 4:0:0:0: [sdb] Unhandled error code
[ 659.213804] sd 4:0:0:0: [sdb]
[ 659.213808] Result: hostbyte=0x01 driverbyte=0x00
[ 659.213812] sd 4:0:0:0: [sdb] CDB:
[ 659.213814] cdb[0]=0x28: 28 00 00 00 00 00 00 00 08 00
[ 659.213826] end_request: I/O error, dev sdb, sector 0
[ 659.213830] Buffer I/O error on device sdb, logical block 0
[ 659.214647] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800b375fe40
[ 659.214656] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800b375fe00
[ 659.320085] usb 2-2: Device not responding to set address.
[ 659.522884] usb 2-2: Device not responding to set address.
[ 659.725646] usb 2-2: device not accepting address 3, error -71
[ 659.832077] usb 2-2: Device not responding to set address.
[ 660.034905] usb 2-2: Device not responding to set address.
[ 660.237663] usb 2-2: device not accepting address 4, error -71
[ 660.344135] usb 2-2: Device not responding to set address.
[ 660.546938] usb 2-2: Device not responding to set address.
[ 660.749642] usb 2-2: device not accepting address 5, error -71
[ 660.856129] usb 2-2: Device not responding to set address.
[ 661.058946] usb 2-2: Device not responding to set address.
[ 661.261701] usb 2-2: device not accepting address 6, error -71
[ 661.261722] hub 2-0:1.0: unable to enumerate USB device on port 2
Last edited by wangsiyuan (2012-10-09 15:30:05)

tail -f /var/log/messages.log is similar to the dmesg.
1) I have a usb 2.0 hard drive which could use the usb 3.0 port.
2) I remeber x230 with windows XP could use my usb 3.0 hard drive with the usb 3.0 port
3) so, it is a problem of archlinux rather than hardware?
thank you!
output of tail -f /var/log/messages.log:
Sep 28 22:00:15 siyuan kernel: [ 1631.021315] usb 4-2: new SuperSpeed USB device number 2 using xhci_hcd
Sep 28 22:00:15 siyuan kernel: [ 1631.115610] usbcore: registered new interface driver uas
Sep 28 22:00:16 siyuan kernel: [ 1631.125728] Initializing USB Mass Storage driver...
Sep 28 22:00:16 siyuan kernel: [ 1631.125929] scsi4 : usb-storage 4-2:1.0
Sep 28 22:00:16 siyuan kernel: [ 1631.126079] usbcore: registered new interface driver usb-storage
Sep 28 22:00:16 siyuan kernel: [ 1631.126081] USB Mass Storage support registered.
Sep 28 22:00:27 siyuan kernel: [ 1642.100134] scsi 4:0:0:0: Direct-Access WD My Passport 0730 1016 PQ: 0 ANSI: 6
Sep 28 22:00:27 siyuan kernel: [ 1642.100581] sd 4:0:0:0: [sdb] 976707584 512-byte logical blocks: (500 GB/465 GiB)
Sep 28 22:00:27 siyuan kernel: [ 1642.100852] sd 4:0:0:0: [sdb] Write Protect is off
Sep 28 22:00:27 siyuan kernel: [ 1642.111571] sdb: sdb1
Sep 28 22:00:27 siyuan kernel: [ 1642.112643] sd 4:0:0:0: [sdb] Attached SCSI disk
Sep 28 22:00:27 siyuan kernel: [ 1642.219396] usb 4-2: Device not responding to set address.
Sep 28 22:00:27 siyuan kernel: [ 1642.422078] usb 4-2: Device not responding to set address.
Sep 28 22:00:27 siyuan kernel: [ 1642.731298] usb 4-2: Device not responding to set address.
Sep 28 22:00:27 siyuan kernel: [ 1642.934099] usb 4-2: Device not responding to set address.
Sep 28 22:00:28 siyuan kernel: [ 1643.243323] usb 4-2: Device not responding to set address.
Sep 28 22:00:28 siyuan kernel: [ 1643.446148] usb 4-2: Device not responding to set address.
Sep 28 22:00:28 siyuan kernel: [ 1643.755321] usb 4-2: Device not responding to set address.
Sep 28 22:00:28 siyuan kernel: [ 1643.958170] usb 4-2: Device not responding to set address.
Sep 28 22:00:29 siyuan kernel: [ 1644.160978] usb 4-2: USB disconnect, device number 2
Sep 28 22:00:29 siyuan kernel: [ 1644.162815] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c41dae40
Sep 28 22:00:29 siyuan kernel: [ 1644.162820] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c41dae00
Sep 28 22:00:29 siyuan kernel: [ 1644.267359] usb 4-2: Device not responding to set address.
Sep 28 22:00:29 siyuan kernel: [ 1644.470263] usb 4-2: Device not responding to set address.
Sep 28 22:00:29 siyuan kernel: [ 1644.779375] usb 4-2: Device not responding to set address.
Sep 28 22:00:29 siyuan kernel: [ 1644.982208] usb 4-2: Device not responding to set address.
Sep 28 22:00:30 siyuan kernel: [ 1645.291402] usb 4-2: Device not responding to set address.
Sep 28 22:00:30 siyuan kernel: [ 1645.494307] usb 4-2: Device not responding to set address.
Sep 28 22:00:30 siyuan kernel: [ 1645.803400] usb 4-2: Device not responding to set address.
Sep 28 22:00:30 siyuan kernel: [ 1646.006252] usb 4-2: Device not responding to set address.
broken pipe wrote:
is it a 2,5" drive with no external power supply?
run: tail -f /var/log/messages.log
and plug in your device, any other errors in log files?

C200 Booting to USB attached iomega Hard Drive

hi guys.
Does anyone know if the C200 will boot to a USB attached Iomega Hard drive for use with their never now software
for system restore in case of hdd failure ?
Im not sure if the Bios will see the external hdd as a bootable device.
Thanks for any replies

It should.
Best regards.
IPnaSh
First Spanish Community Guru - Colaborador ad honorem

Hey, can i clone my Macbook Pro internal hard drive and then paste it all onto a formated external hard drive, then make the Mac use the external as the primary hard drive?

hey, can i clone my Macbook Pro internal hard drive and then paste it all onto a formated external hard drive, then make the Mac use the external as the primary hard drive? please help for i only have around 618mb left out of 189GB!!!!!!!!!!!!!!!!

If what doesn't work?
If cloning your internal drive to the external drive is not successful, I expect CCC will tell you so. Assuming that doesn't happen, you will have a bootable replica of the internal drive on the external drive once CCC has finished.
You can then do any of several things:
1. Replace your internal drive with a much larger one (320GB or 500GB, or even larger), and clone the external drive's contents onto the new drive so you'll have all your data in one place. Note that if you do this, you'll also need to buy an external drive that's large enough to back the new internal drive up on.
2. Boot from the external drive as a temporary measure while you clear at least 30-40GB of data off the internal drive, allowing you to keep using it and saving small amounts of data to it. The external drive will then contain the only copies of the files you've deleted from the internal drive, so you'll need a seond external drive large enough to back both the other drives up on.
If you can't comfortably clear a minimum of 30GB off the internal drive, you really need a larger internal drive right now, and you shouldn't bother fooling around with the inadequate one you have — you'll just quickly overfill it again.
3. Replace the optical drive in your MBP with a large conventional hard drive, giving you two hard drives inside the machine. You will then need one or more external drives large enough to back up both of the internal drives.
If you sense a theme here — back up, back up, back up — you are correct. It's flat-out foolhardy to own or use a computer without maintaining complete, up-to-date backups of everything at all times.

Advice on what might be the best networked external hard drive to create my own cloud storage?

Anyone have any advice on what might be the best networked external hard drive to create my own cloud storage? That way I can have access to all my stored files, songs, pictures and most of all movies on lets say my laptop or iPad. Since there is not very much storage on the iPad. I want to be able to access my hundreds of movies that I have from in my home on my network or away from my home as long as I have an internet connection. I know there is a Seagate one and a Western digital one, does anyone else know of any others or have any advice on which is the best? A plus would be for an external storage device that I would be able to access my movies through my apple to tv? Please help been looking for almost a year and cant make up my mind on what product to buy for what I am trying to do and create my own personal cloud storage.

SM66 wrote:
Or, I might have to do the old technique of using the Pen Tool in Illustrator and tracing over the filligree.
That's probably what I would do. If you're not well-practiced in Illustrator, this will be a good exercise. Just place the image you have, lock it down (either the object, or you can put it on it's own layer and lock the layer) and start with the pen tool.
Everyone probably has their own method, but I like to start by placing all the points I think I'll need as corner points (click, but don't drag to make the point curved). I then pick the Direct Selection tool (white arrow) and then the Convert Anchor Point tool. If you click on a point, you can drag it to be curved, but if you hold the Command key (on Mac OS) it will temporarily switch to the Direct Selection tool, which will allow you to move the point if necessary. Others would just make curved points as they go, but this is how I like to do it.
For the pointy shapes on the end, you could probably make one then rotate a copy. For the curvy parts in the middle, you may be able to make one and scale copies, or use the blend tool. As you go, you can switch the visibility of the placed graphic on and off to see how your creation looks on it's own, and when compared to the original.

Losing connection to external drives, tried disc utility got a message "No live updatin...? Retried new connections; is there a way to test the external usb hub? The drives will occasionally display in Apple profile. Any help would be deeply appreciated

Losing connection to external drives, tried disc utility got a message "No live updatin...? Retried new connections; is there a way to test the external usb hub? The drives will occasionally display in Apple profile. Any help would be deeply appreciated

It's not just you, I can't authorise my phone. It seemed to go down just after I started the update (it wasn't my fault though). I am using chrome, and it does not seem to be a firewall issue, or the bannerblock issue that I read about else where, since I dont have that program installed. Strange though how the support forum is still running. If I go to http://www.apple.com/support I get nothing, but googling topics allows me to see em.

Booting permanently from external (USB 3 or Thunderbolt) drive?

I'm interested in upgrading my 2010 iMac to one of the new 2012 models, specifically for their USB 3 and Thunderbolt port offerings.
My question is; if I have an external USB 3 or Thunderbolt drive enclosure with an SSD, can I *safely and reliably* boot from this external drive for as long as I own the iMac (ie, never use the 1 TB internal HDD that comes with the iMac)? I'm not interested in Fusion Drive, as I'd rather pay that $250 toward a speedier SSD and external drive that I can own and freely move among different machines.
But I've read different accounts in other forums about the reliability of using USB as your primary external boot source, namely since it relies on the CPU and you'll get slightly diminsihed performance and/or errors over time. Maybe Thunderbolt is the way to go? Any advice on this?
I see posts like this one (http://fortysomethinggeek.blogspot.ca/2012/10/blacx-5g-usb-30-update-fastest-usb -30.html) and it gives me hope, but I don't want to have to deal with random crashes attributable solely to my use of an external drive as my primary boot source. Is anyone else using this kind of external-only setup, and can you please let me know your thoughts and experiences thus far?
Thanks!

First and foremost: Are you using OPTION to try to select the USB-DVD to boot from?
The MacBook Air has to, and has to place a set of Apple supplied drivers on USB I think or has USB DVD support.
http://www.apple.com/support/bootcamp
one feature Boot Camp Assistant has been broken never worked part of 10.6.6, to download drivers to put on CD/USB. So that is 5 months status: broken and unacknowledged officially.
http://support.apple.com/kb/HT4407
A nice normal walk-thru install, what I think most expect -
http://www.simplehelp.net/2009/01/15/using-boot-camp-to-install-windows-7-on-you r-mac-the-complete-walkthrough/

External USB 2.0 hard drive reconnects on its own after power-down

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