My iMac restarts everytime time machine is backing getting this error

my iMac restarts everytime time machine is backing up i had time capsule so   i changed back up disk to seagate and still does it.
getting this error any help would be great  and im not real computer smart
Interval Since Last Panic Report:  415540 sec
Panics Since Last Report:          5
Anonymous UUID:                    50E71E33-0C3E-B6B0-1F87-93F5501AF275
Fri Apr 12 18:09:41 2013
panic(cpu 0 caller 0xffffff8000e43d5b): "a freed zone element has been modified in zone: cluster_write"@/SourceCache/xnu/xnu-2050.18.24/osfmk/kern/zalloc.c:214
Backtrace (CPU 0), Frame : Return Address
0xffffff80f1b23680 : 0xffffff8000e1d626
0xffffff80f1b236f0 : 0xffffff8000e43d5b
0xffffff80f1b23730 : 0xffffff8000e435d2
0xffffff80f1b23810 : 0xffffff8000ee80cf
0xffffff80f1b23840 : 0xffffff8000ee4cd7
0xffffff80f1b239d0 : 0xffffff8000ee337e
0xffffff80f1b23c30 : 0xffffff8000ee2ff5
0xffffff80f1b23c60 : 0xffffff80010fb26d
0xffffff80f1b23d70 : 0xffffff8000f11da2
0xffffff80f1b23dd0 : 0xffffff8000f08179
0xffffff80f1b23e40 : 0xffffff80011770e9
0xffffff80f1b23ef0 : 0xffffff80011772e4
0xffffff80f1b23f50 : 0xffffff80011e182a
0xffffff80f1b23fb0 : 0xffffff8000eced33
BSD process name corresponding to current thread: backupd
Mac OS version:
12C60
Kernel version:
Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333
Kernel slide:     0x0000000000c00000
Kernel text base: 0xffffff8000e00000
System model name: iMac11,1 (Mac-F2268DAE)
System uptime in nanoseconds: 4702215649822
last loaded kext at 237598977526: com.apple.filesystems.smbfs          1.8 (addr 0xffffff7f82f02000, size 229376)
last unloaded kext at 161063000383: com.apple.driver.AppleUSBUHCI          5.2.5 (addr 0xffffff7f81825000, size 65536)
loaded kexts:
com.seagate.driver.PowSecLeafDriver_10_5          5.2.4
com.seagate.driver.PowSecDriverCore          5.2.4
com.apple.filesystems.smbfs          1.8
com.apple.filesystems.msdosfs          1.8
com.apple.driver.AppleBluetoothMultitouch          75.15
com.apple.filesystems.ntfs          3.10
com.apple.driver.AudioAUUC          1.60
com.apple.driver.AGPM          100.12.69
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleHDA          2.3.1f2
com.apple.driver.AppleUpstreamUserClient          3.5.10
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.kext.AMDFramebuffer          8.0.0
com.apple.iokit.IOBluetoothSerialManager          4.0.9f33
com.apple.driver.AppleMikeyDriver          2.3.1f2
com.apple.ATIRadeonX2000          8.0.0
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.0.9f33
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.ApplePolicyControl          3.2.11
com.apple.driver.AppleBacklight          170.2.3
com.apple.driver.AppleMCCSControl          1.0.33
com.apple.driver.AppleIRController          320.15
com.apple.driver.AppleUSBCardReader          3.1.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          34
com.apple.iokit.SCSITaskUserClient          3.5.1
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.2.2
com.apple.driver.AppleUSBHub          5.2.5
com.apple.driver.AppleFWOHCI          4.9.6
com.apple.iokit.AppleBCM5701Ethernet          3.2.5b3
com.apple.driver.AirPort.Atheros40          600.70.23
com.apple.driver.AppleAHCIPort          2.4.1
com.apple.driver.AppleUSBEHCI          5.4.0
com.apple.driver.AppleEFINVRAM          1.6.1
com.apple.driver.AppleACPIButtons          1.6
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleHPET          1.7
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.6
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
com.apple.nke.applicationfirewall          4.0.39
com.apple.security.quarantine          2
com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
com.apple.driver.AppleBluetoothHIDKeyboard          165.5
com.apple.driver.AppleHIDKeyboard          165.5
com.apple.driver.IOBluetoothHIDDriver          4.0.9f33
com.apple.driver.AppleMultitouchDriver          235.28
com.apple.kext.triggers          1.0
com.apple.driver.DspFuncLib          2.3.1f2
com.apple.iokit.IOAudioFamily          1.8.9fc10
com.apple.kext.OSvKernDSPLib          1.6
com.apple.iokit.IOSurface          86.0.3
com.apple.iokit.IOSerialFamily          10.0.6
com.apple.iokit.IOBluetoothFamily          4.0.9f33
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.0.9f33
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.AppleHDAController          2.3.1f2
com.apple.iokit.IOHDAFamily          2.3.1f2
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.IOPlatformPluginFamily          5.2.0d16
com.apple.driver.AppleSMC          3.1.4d2
com.apple.kext.AMD4800Controller          8.0.0
com.apple.kext.AMDSupport          8.0.0
com.apple.driver.AppleGraphicsControl          3.2.11
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.iokit.IONDRVSupport          2.3.5
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.iokit.IOGraphicsFamily          2.3.5
com.apple.iokit.IOUSBHIDDriver          5.2.5
com.apple.iokit.IOUSBMassStorageClass          3.5.0
com.apple.driver.AppleUSBMergeNub          5.2.5
com.apple.driver.AppleUSBComposite          5.2.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.1
com.apple.iokit.IOBDStorageFamily          1.7
com.apple.iokit.IODVDStorageFamily          1.7.1
com.apple.iokit.IOCDStorageFamily          1.7.1
com.apple.iokit.IOFireWireSBP2          4.2.0
com.apple.iokit.IOSCSIBlockCommandsDevice          3.5.1
com.apple.iokit.IOAHCISerialATAPI          2.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.1
com.apple.iokit.IOFireWireFamily          4.5.5
com.apple.iokit.IOUSBUserClient          5.2.5
com.apple.iokit.IOEthernetAVBController          1.0.2b1
com.apple.iokit.IO80211Family          500.15
com.apple.iokit.IONetworkingFamily          3.0
com.apple.iokit.IOAHCIFamily          2.2.1
com.apple.iokit.IOUSBFamily          5.4.0
com.apple.driver.AppleEFIRuntime          1.6.1
com.apple.iokit.IOHIDFamily          1.8.0
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          220
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          344
com.apple.iokit.IOStorageFamily          1.8
com.apple.driver.AppleKeyStore          28.21
com.apple.driver.AppleACPIPlatform          1.6
com.apple.iokit.IOPCIFamily          2.7.2
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0
Model: iMac11,1, BootROM IM111.0034.B02, 4 processors, Intel Core i7, 2.8 GHz, 8 GB, SMC 1.54f36
Graphics: ATI Radeon HD 4850, ATI Radeon HD 4850, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.70.23-P2P
Bluetooth: Version 4.0.9f33 10885, 2 service, 18 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Network Service: Leapfrog Device (en5), Ethernet, en5
Serial ATA Device: ST31000528AS, 1 TB
Serial ATA Device: HL-DT-ST DVDRW  GA11N, 9.2 MB
USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Backup+ Desk Mac, 0x0bc2  (Seagate LLC), 0xa0a5, 0xfa130000 / 6
USB Device: USB-SATA Bridge, 0x067b  (Prolific Technology, Inc.), 0x2571, 0xfa140000 / 5
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa120000 / 4
USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 7
USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
USB Device: hub_device, 0x0409  (NEC Corporation), 0x005a, 0xfd130000 / 5
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd110000 / 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device. 
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click  Log in.
*Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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