Spontaneous ejection of usb drive, with improper ejection notice

Hello all, i have been having some problems with a JMicron 0x2329 usb enclosure, on a new iMac. Sometimes it suddenly unmounts, giving the "improper ejection" warning. To which i usually reply out loud- "No i'm pretty sure i didn't- you did." It doesn't make any difference, it refuses to take responsibility for it's actions.
I guess the first thing is... is it the computer, the enclosure, or both?
It's not the cable.
It's not the directory, diskwarrior gave it the green light, and i optimized it anyway.
disk utility finds no problems
Inside is a hitachi 1TB, hfs journaled drive
1 partition
I've stopped and started journaling
I've turned off ownership.
It's been plugged into the computer, and a powered hub.
It's intermittent (it appears that way anyway)
the computer is as follows:
Model Name:                           iMac
Model Identifier:                   iMac12,2
Processor Name:                   Intel Core i5
Processor Speed:                    2.7 GHz
Number of Processors:           1
Total Number of Cores:         4
L2 Cache (per Core):             256 KB
L3 Cache:                              6 MB
Memory:                               4 GB
Boot ROM Version:               IM121.0047.B1E
SMC Version (system):          1.72f5
Serial Number (system):
Hardware UUID:                    891F70C4-5185-5CA8-994D-D28AFEB9E27F
and here is the crux of the console output during such an event:
12-06-04 12:02:05.000 PM kernel: disk3s3: I/O error.
12-06-04 12:02:05.000 PM kernel: IOUSBMassStorageClass[0xffffff800b9ad400]: The device is still unresponsive after 6 consecutive USB Device Resets; it will be terminated.
12-06-04 12:02:05.000 PM kernel: disk3s3: device/channel is not attached.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: disk3s3: media is not present.
12-06-04 12:02:05.000 PM kernel: jnl: disk3s3: do_jnl_io: strategy err 0x6
12-06-04 12:02:05.000 PM kernel: jnl: disk3s3: write_journal_header: error writing the journal header!
12-06-04 12:02:05.000 PM kernel: jnl: disk3s3: close: journal 0xffffff800ba00cc0, is invalid. aborting outstanding transactions
12-06-04 12:02:05.741 PM com.apple.revisiond: [ERROR] GSManager.m:-[GSManager _markLibraryCleanWithFSEventID:]:4827 Failed to mark library at path "/.vol/234881036/2/.DocumentRevisions-V100" clean.
12-06-04 12:02:05.847 PM Finder: ISGetIconFamilyFromStorage: seed mismatch for 28d40028, actual seed is 71f32454
12-06-04 12:02:05.847 PM Finder: ISGetIconFamilyFromStorage: seed mismatch for 2dab0029, actual seed is 2ca88611
12-06-04 12:02:05.847 PM Finder: ISGetIconFamilyFromStorage: seed mismatch for 2cb2002a, actual seed is 836c40e
12-06-04 12:12:34.000 PM kernel: USBMSC Identifier (non-unique): F60705FFFFFF 0x152d 0x2329 0x100
12-06-04 12:12:35.000 PM kernel: jnl: disk3s3: replay_journal: from: 55953920 to: 57605120 (joffset 0xd4f17f000)
12-06-04 12:12:36.256 PM fseventsd: event logs in /Volumes/DriveDockFront/.fseventsd out of sync with volume. destroying old logs. (36121 1 36121)
12-06-04 12:12:36.324 PM fseventsd: log dir: /Volumes/DriveDockFront/.fseventsd getting new uuid: B327FAA5-68A9-4131-A7B1-EE029E2FB080
12-06-04 12:12:36.000 PM kernel: jnl: disk3s3: journal replay done.
12-06-04 12:12:36.000 PM kernel: hfs: Removed 0 orphaned / unlinked files and 1 directories

coming back to let people know that my drive is back to normal. The problem(s)? Spotlight, and time-machine. Maybe it's one in the same, but wow i am really starting to hate both of those things. I don't even use time-machine, but something about the way it works (or doesn't) with spotlight has given me trouble more than once. It shows up as a trouble-maker in console despite me not using it. The solution was to go in and delete every file that wasn't a file if you get what it mean haha- .ds, catalogs, plist etc. basically anything invisible (it's not a startup drive and there's no applications on it)- then unplug the drive and plug it into a different bus. This caused spotlight to think it was brand new, and successfully scanned it. Before, every time it tried to do that, it meant guaranteed spontaneous ejection within 30 seconds. I'm guessing that all this had something to do with a new computer, and jumping from leopard to lion. (and ppc to intel) I'm not sure. What i am sure of is that there seems to be a common element in these types of problem threads, the "invalid journal header" or similar variant. The fact that it works perfectly now and has been cataloged, and searching it works fine tells me that the suspicions that it was the drive controller or some other hardware-related issue were unfounded. It's sloppy handling by spotlight and/or time-machine corrupting things. Things which diskwarrior and the like don't recognize as issues.

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Yeah this definitely appears to be a problem specifically with this mac. It's been having all sorts of weird problems lately, and we figured that upgrading to Maverick might fix them (but instead we got new problems).
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Use OS X' Disk Utility to burn it to a CD.
Insert the CD you just burned (if it ejected afterwards), and then restart your Mac.
Hold down the 'C' key on the keyboard as the Mac boots, and it should switch to booting off the CD. Once the CD starts loading, you can let go. It will take a couple of minutes, but it will eventually boot into Linux.
Attach your USB drive.
Run gparted (you need to search the menus for it, it's under system administration, I think -- or you can open up a terminal window and simply type 'gparted').
Find your disk (/dev/sdb or /dev/sda) and partition and format it using the filesystem you want.
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Duplicate USB Drives With Automator or AS?

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try this. copy the following into the AppleScript editor, modify it with the appropriate details, save it as a script, then attach it as a folder action to /Volumes (that I know you can do - this is just a pared-down version of my own folder action).
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So a guy goes into his doctors office and tells his doctor "Ya gotta
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Verifying volume “MyDrive”
Checking file system** /dev/disk2s1
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Hi,
Good to be here - first post!
Needing more capacity I bought a Seagate FreeAgent Go 2.5 inch 120GB drive that draws its power from the computer using two USB ports.
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iostat -En< ... snip SCSI & DVD drives ... >
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Did you try
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Spontaneous ejection of usb drive, with improper ejection notice

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