I'm desperate! Loosing external USB disk 100gb log's

Hi,
I am completely desperate. I own a 27" imac i3 and have a external Lacie 500gb USB disk connected directly. This disk is disconnecting all the time, I am not abel to complete a backup. Reformatting does not help, treid other cable (and an other one), did not help. Same disk works fine with my MacBook Pro and worked fine on the G4 iMac for 2 months.
After a period the logs become so big that I get a Disk full (internal disk) message. I get these messages in the Kernel log:
Mar 15 23:14:56 iMac kernel[0]: USBF: 6445.298 [0x8455e00] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 4 of Hub at 0xfd100000)
Mar 15 23:14:57 iMac kernel[0]: USBF: 6446.130 [0x8455e00] The IOUSBFamily gave up enumerating a USB device after 10 retries. (Port 4 of Hub at 0xfd100000)
Mar 15 23:14:57 iMac kernel[0]: USBF: 6446.130 [0x8455e00] The IOUSBFamily was not able to enumerate a device.
Mar 15 23:15:20 iMac kernel[0]: USBMSC Identifier (non-unique): ST3500820A 9QM0F7W5 0x59f 0x1010 0xc683
Mar 15 23:15:22 iMac kernel[0]: jnl: disk1s2: replay_journal: from: 1468416 to: 16851456 (joffset 0xe8e000)
Mar 15 23:15:36 iMac kernel[0]: jnl: disk1s2: journal replay done.
Mar 15 23:16:42 iMac kernel[0]: IOUSBMassStorageClass[0x8a33600]: The device is still unresponsive after 6 consecutive USB Device Resets; it will be terminated.
Mar 15 23:16:42 iMac kernel[0]: disk1s2: device/channel is not attached.
Mar 15 23:16:42: --- last message repeated 1 time ---
Mar 15 23:16:42 iMac kernel[0]: disk1s2: media is not present.
Mar 15 23:16:42: --- last message repeated 4 times ---
Mar 15 23:16:42 iMac kernel[0]: jnl: disk1s2: dojnlio: strategy err 0x6
Mar 15 23:16:42 iMac kernel[0]: jnl: disk1s2: writejournalheader: error writing the journal header!
Mar 15 23:16:42 iMac kernel[0]: disk1s2: media is not present.
Mar 15 23:16:42 iMac kernel[0]: jnl: disk1s2: dojnlio: strategy err 0x6
Mar 15 23:16:42 iMac kernel[0]: jnl: disk1s2: end_transaction: only wrote 0 of 679936 bytes to the journal!
Mar 15 23:16:42 iMac kernel[0]: disk1s2: media is not present.
Can anybody help PLEASE?

Try creating a fresh user account and see if you get the same issue on that one. If so, you might be looking at a problem with your USB bus (unfortunately).

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    System requirements
    A Mac running OS X Lion with an existing Recovery HD
    An external USB hard drive or thumb drive with at least 1GB of free space
    How to use Lion Recovery Disk Assistant
    The Lion Recovery Disk Assistant will erase all data on the external drive when creating the Recovery HD. You should either backup your data before running the Lion Recovery Disk Assistant, or create a new partition on the external drive.

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