Imac freezing while connecting external hard drive

hi
I am using imac late 2011 model core i5 4gb ram. I recently bought seagate freeagent goflex desk 2tb version and im using it as time machine. but when it is connected system is freezing frequently and some times i am getting kernel panic error but after disconnecting it imac runs smoothly i used my system with out connecting for few days and there is no problem at all but when i am connecting and using it all this happens again. Is there any solution to it. Another thing i am also using freeagent goflex portable drive for last one year and i didint experienced such problems at all. If any one knows about it pleaese tell me thank you

Interval Since Last Panic Report: 26200 sec
Panics Since Last Report:          1
Anonymous UUID:                    52BEFACE-2318-43CB-A26F-E005FB7F83E8
Sat May 19 11:56:37 2012
panic(cpu 0 caller 0xffffff8000244561): "zalloc: \"kalloc.8192\" (257 elements) retry fail 3, kfree_nop_count: 0"@/SourceCache/xnu/xnu-1699.24.23/osfmk/kern/zalloc.c:1677
Backtrace (CPU 0), Frame : Return Address
0xffffff807fd63cc0 : 0xffffff8000220702
0xffffff807fd63d40 : 0xffffff8000244561
0xffffff807fd63e30 : 0xffffff800022662d
0xffffff807fd63e60 : 0xffffff8000212116
0xffffff807fd63e80 : 0xffffff8000222f56
0xffffff807fd63eb0 : 0xffffff8000214829
0xffffff807fd63f10 : 0xffffff800021bb58
0xffffff807fd63f70 : 0xffffff80002aeb80
0xffffff807fd63fb0 : 0xffffff80002d8383
BSD process name corresponding to current thread: Mechanical Clock
Mac OS version:
11D50d
Kernel version:
Darwin Kernel Version 11.3.0: Thu Jan 12 18:47:41 PST 2012; root:xnu-1699.24.23~1/RELEASE_X86_64
Kernel UUID: 7B6546C7-70E8-3ED8-A6C3-C927E4D3D0D6
System model name: iMac12,1 (Mac-942B5BF58194151B)
System uptime in nanoseconds: 12740316659178
vm objects:15604512
vm object hash entri:2015520
non-kernel map entri:4002480
kernel map entries:10424320
pv_list:11905440
kalloc.32:1974272
kalloc.64:172974080
kalloc.128:660213760
kalloc.256:658989056
kalloc.512:1626112
kalloc.1024:1720320
kalloc.4096:1277952
kalloc.8192:2105344
vm pages:73341936
ipc ports:3728944
vnodes:16507128
namecache:6201600
HFS node:20986752
HFS fork:6373376
decmpfs_cnode:1640160
ubc_info zone:3612240
vnode pager structur:2019600
Kernel Stacks:2932736
PageTables:31227904
Kalloc.Large:11839674
Backtrace suspected of leaking: (outstanding bytes: 220672)
0xffffff800022662d
0xffffff80005e0bb0
0xffffff80006455a5
0xffffff80006456a1
0xffffff7f8090e1ac
0xffffff7f80915922
0xffffff7f80868ae9
0xffffff7f8086aad2
0xffffff7f807d30e7
0xffffff800023db2c
      Kernel Extensions in backtrace:
         com.apple.iokit.IOSCSIArchitectureModelFamily(3.0.3)[22C0B87C-6E38-34EA-9520-98 54EAC9ECE2]@0xffffff7f807cd000->0xffffff7f807f7fff
         com.apple.iokit.IOSCSIBlockCommandsDevice(3.0.3)[1A93A057-75E4-3ABC-BC2D-2CDDA9 1D5AE5]@0xffffff7f80865000->0xffffff7f80879fff
            dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(3.0.3)[22C0B87C-6E38-34EA-9520-98 54EAC9ECE2]@0xffffff7f807cd000
            dependency: com.apple.iokit.IOStorageFamily(1.7)[E0606FD9-7CC1-3E36-BC0A-E0768FF988E4]@0xff ffff7f80769000
         com.seagate.driver.PowSecDriverCore(5.2.2)[F1208D07-4D35-0191-3638-3D7CA8C9D5CF ]@0xffffff7f8090c000->0xffffff7f80943fff
            dependency: com.apple.iokit.IOUSBFamily(4.5.8)[1FEB88C1-AD15-3AEF-8379-CA51810FD38E]@0xffff ff7f80816000
            dependency: com.apple.iokit.IOSCSIBlockCommandsDevice(3.0.3)[1A93A057-75E4-3ABC-BC2D-2CDDA9 1D5AE5]@0xffffff7f80865000
            dependency: com.apple.iokit.IOStorageFamily(1.7)[E0606FD9-7CC1-3E36-BC0A-E0768FF988E4]@0xff ffff7f80769000
            dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(3.0.3)[22C0B87C-6E38-34EA-9520-98 54EAC9ECE2]@0xffffff7f807cd000
            dependency: com.apple.iokit.IOFireWireSBP2(4.2.0)[A0E6214A-8E81-3136-AA18-5E4E9DFD5419]@0xf fffff7f808ef000
last loaded kext at 37980543867: com.apple.filesystems.msdosfs          1.7.1 (addr 0xffffff7f8098c000, size 57344)
last unloaded kext at 368198465969: com.apple.driver.AppleUSBUHCI          4.4.5 (addr 0xffffff7f80a87000, size 65536)
loaded kexts:
com.seagate.driver.PowSecLeafDriver_10_5          5.2.2
com.seagate.driver.PowSecDriverCore          5.2.2
com.apple.filesystems.msdosfs          1.7.1
com.apple.driver.AppleHWSensor          1.9.4d0
com.apple.driver.AppleBluetoothMultitouch          66.6
com.apple.filesystems.autofs          3.0
com.apple.driver.AGPM          100.12.42
com.apple.driver.AudioAUUC          1.59
com.apple.driver.IOBluetoothSCOAudioDriver          4.0.3f12
com.apple.driver.IOBluetoothA2DPAudioDriver          4.0.3f12
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.driver.AppleHDA          2.1.7f9
com.apple.driver.AppleUpstreamUserClient          3.5.9
com.apple.driver.AppleMCCSControl          1.0.26
com.apple.driver.AppleMikeyDriver          2.1.7f9
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AudioIPCDriver          1.2.2
com.apple.kext.ATIFramebuffer          7.1.8
com.apple.driver.AppleSMCLMU          2.0.1d2
com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.5d4
com.apple.driver.AppleLPC          1.5.3
com.apple.driver.AppleBacklight          170.1.9
com.apple.ATIRadeonX3000          7.1.8
com.apple.driver.AppleIntelHD3000Graphics          7.1.8
com.apple.iokit.SCSITaskUserClient          3.0.3
com.apple.driver.AppleUSBCardReader          3.0.1
com.apple.driver.AppleIRController          312
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          33
com.apple.iokit.IOAHCIBlockStorage          2.0.1
com.apple.driver.AppleUSBHub          4.5.0
com.apple.driver.AppleFWOHCI          4.8.9
com.apple.driver.AirPort.Atheros40          503.60.3
com.apple.driver.AppleEFINVRAM          1.5.0
com.apple.iokit.AppleBCM5701Ethernet          3.0.8b2
com.apple.driver.AppleAHCIPort          2.2.0
com.apple.driver.AppleUSBEHCI          4.5.8
com.apple.driver.AppleACPIButtons          1.4
com.apple.driver.AppleRTC          1.4
com.apple.driver.AppleHPET          1.6
com.apple.driver.AppleSMBIOS          1.7
com.apple.driver.AppleACPIEC          1.4
com.apple.driver.AppleAPIC          1.5
com.apple.driver.AppleIntelCPUPowerManagementClient          167.3.0
com.apple.nke.applicationfirewall          3.2.30
com.apple.security.quarantine          1.1
com.apple.driver.AppleIntelCPUPowerManagement          167.3.0
com.apple.iokit.CHUDProf          366
com.apple.iokit.CHUDUtils          364
com.apple.driver.AppleBluetoothHIDKeyboard          152.3
com.apple.driver.AppleHIDKeyboard          152.3
com.apple.driver.AppleMultitouchDriver          220.62.1
com.apple.driver.IOBluetoothHIDDriver          4.0.3f12
com.apple.kext.triggers          1.0
com.apple.driver.AppleAVBAudio          1.0.0d11
com.apple.driver.DspFuncLib          2.1.7f9
com.apple.iokit.IOSurface          80.0
com.apple.iokit.IOBluetoothSerialManager          4.0.3f12
com.apple.iokit.IOSerialFamily          10.0.5
com.apple.iokit.IOAVBFamily          1.0.0d22
com.apple.iokit.IOAudioFamily          1.8.6fc6
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.iokit.IOFireWireIP          2.2.4
com.apple.driver.AppleHDAController          2.1.7f9
com.apple.iokit.IOHDAFamily          2.1.7f9
com.apple.driver.ApplePolicyControl          3.0.16
com.apple.driver.AppleSMC          3.1.1d8
com.apple.driver.IOPlatformPluginFamily          4.7.5d4
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleGraphicsControl          3.0.16
com.apple.driver.AppleBacklightExpert          1.0.3
com.apple.driver.AppleThunderboltEDMSink          1.1.3
com.apple.driver.AppleThunderboltEDMSource          1.1.3
com.apple.kext.ATI6000Controller          7.1.8
com.apple.kext.ATISupport          7.1.8
com.apple.iokit.IONDRVSupport          2.3.2
com.apple.driver.AppleIntelSNBGraphicsFB          7.1.8
com.apple.iokit.IOGraphicsFamily          2.3.2
com.apple.driver.AppleThunderboltDPOutAdapter          1.5.9
com.apple.driver.AppleThunderboltDPInAdapter          1.5.9
com.apple.driver.AppleThunderboltDPAdapterFamily          1.5.9
com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.1
com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.3f12
com.apple.driver.AppleUSBBluetoothHCIController          4.0.3f12
com.apple.iokit.IOBluetoothFamily          4.0.3f12
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.0.3
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.7
com.apple.iokit.IOCDStorageFamily          1.7
com.apple.iokit.IOUSBMassStorageClass          3.0.1
com.apple.iokit.IOAHCISerialATAPI          2.0.1
com.apple.iokit.IOUSBHIDDriver          4.4.5
com.apple.driver.AppleUSBMergeNub          4.5.3
com.apple.driver.AppleUSBComposite          4.5.8
com.apple.driver.XsanFilter          403
com.apple.iokit.IOFireWireSBP2          4.2.0
com.apple.iokit.IOSCSIBlockCommandsDevice          3.0.3
com.apple.iokit.IOSCSIArchitectureModelFamily          3.0.3
com.apple.driver.AppleThunderboltNHI          1.3.2
com.apple.iokit.IOThunderboltFamily          1.7.4
com.apple.iokit.IOUSBUserClient          4.5.8
com.apple.iokit.IOFireWireFamily          4.4.5
com.apple.iokit.IO80211Family          412.2
com.apple.iokit.IOEthernetAVBController          1.0.0d5
com.apple.iokit.IONetworkingFamily          2.0
com.apple.iokit.IOAHCIFamily          2.0.7
com.apple.iokit.IOUSBFamily          4.5.8
com.apple.driver.AppleEFIRuntime          1.5.0
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          177.3
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.iokit.CHUDKernLib          365
com.apple.driver.DiskImages          331.3
com.apple.iokit.IOStorageFamily          1.7
com.apple.driver.AppleKeyStore          28.18
com.apple.driver.AppleACPIPlatform          1.4
com.apple.iokit.IOPCIFamily          2.6.8
com.apple.iokit.IOACPIFamily          1.4
System Profile:
Model: iMac12,1, BootROM IM121.0047.B1D, 4 processors, Intel Core i5, 2.5 GHz, 4 GB, SMC 1.71f22
Graphics: AMD Radeon HD 6750M, AMD Radeon HD 6750M, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3231554538424655302D444A2D4620
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3231554538424655302D444A2D4620
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.61.5-P2P
Bluetooth: Version 4.0.3f12, 2 service, 18 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: ST3500418AS, 500.11 GB
Serial ATA Device: OPTIARC DVD RW AD-5690H
USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x850b, 0xfa200000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 5
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: USB Optical Mouse, 0x15ca, 0x00c3, 0xfd130000 / 5
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfd110000 / 3

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Option #2 » Cost:CDN*$317*
Buy a LaCie D2 1TB external hard drive with Firewire 800 for CDN$317 (tax+shipping included) either from a U.S. retailer (e.g. iUnitek) or a Canadian one. Prices at Canadian online retailers start from CDN$266 + CDN$37 (13% tax) + CDN$18 (shipping) = CDN$321, which is just CDN$4 more than in the States, taking into account the exchange rate.
So, there you. From the financial point of view, the incentive is to get an internal hard drive, which I don't mind at all. I'd like to install Vista on a 30-40GB partition, if that makes a difference. If I were to get an external hard drive, I would keep all of my data (e.g. music, movies, documents, music, etc) on it and reserve the internal 320GB hard drive for system files and OS.
What would justify paying a premium for an external hard drive other than portability? If I were to get one, I would need to be able to access it not only from my iMac's Vista partition, but also from my HP Vista laptop. Same applies to the internal hard drive. If I were to get a Samsung F1, I would still need to access my mac files from Vista's partition (when I boot into Vista) as well as from my HP Vista laptop (over wi-fi). FYI: I have no use for Time Machine, since I've never deleted a file which I needed to recover..well, maybe once or twice. What I DO need is a utility to synchronize files across machines. Hence, I will need some kind of program to automatically sync my iMac files with my HP laptop files. Currently, I utilize SyncBackSE to sync files between my HP laptop and my PC over Wi-Fi every morning at 6am. Works like a charm.
That's my dilemma in a nutshell. Any comments, suggestions and words of wisdom are welcome.
P.S. I'm also planning on upgrading RAM to 4GB. Newegg.ca is running a promotion (http://www.newegg.ca/Product/Product.aspx?Item=N82E16820227251): $72 CDN minus $20 USD mail-in rebate. It's not related to my question in any way, but some Canadians might find this info relevant.

Well, I don't have the budget for both and as I've already pointed out, Time Machine does not address my needs. It's a great backup solution, but what I need is a synchronization solution. I need to have the same versions of basic files, such as music, photos, documents, and other miscellaneous stuff on my iMac and my HP Vista laptop. Even if I were to get a MacBook in the future, I would still need the same set-up. That way, if something happens to either my iMac or my MacBook, I would always be able to simply copy-paste files from one machine to another. That's, sort of, my version of a perfect backup solution...unless, there's an option to load up files from a Time Machine backup onto a separate one (e.g. MacBook). In the end, Time Machine only partially addresses my need in keeping 2 machines backed up in a sense that it only backs up one of them. My solution kills 2 birds with one stone. I would have 2 syncronized computers (e.g. iMac + HP Laptop, iMac + MacBook) AND both computers would serve as mutual backup sources, since whatever happens to one of them, I would always be able to copy data from the other.
The problem arises when I factor in the sheer number of gigabytes required on the portable computer to mirror everything from the iMac, whether be it a Windows laptop or a MacBook. I would always have more data on my iMac than the available space on a smaller hard drive. I now have 432GB of stuff and I can presume that this number will only grow. Hence, at any given time I would be able to synchronize only the most essential files to the laptop. Ideally, I would need a NAS which would collect = synchronize data from both machines. That way, whenever files get modified, changes would automatically be transferred to the NAS and routed further down the chain to the iMac. It would work both ways, obviously. In that scenario, I don't need to worry about any of the computers, since whichever one fails on me, I would always have a copy of the entire collection of files. Now, that I doubt Time Machine can accomplish.

Can I use my IPad as a backup for my IMac instead of an external hard drive?

I'm wondering if I can use my iPad as a backup for my iPad instead of an external hard drive?

As your question says backup for your iMac I assume that is what you mean, as opposed to what is in the text. The iPad doesn't have a disk mode, and you can only copy onto it content that is supported by the apps that you've got. So personally I'd say no - external hard drives are easier to use as a backup and are a lot cheaper

Time machine backup of connected external hard drive

Morning all,
I've read through various posts regarding my question but most appear to be slightly vague for my understanding.
I have a 3TB TM with a 500GB external mac formatted hard drive connected via USB. This hard drive contains music and a couple of years photos that will eventually go into iPhoto once sorted but I'd like TM to back up this hard drive for the moment.
Upon entering TM Preferences and the Select Disk button, I have a list of backup drives that includes the external hard drive. The default backup disk is the TM.
What I cannot understand is how to get TM to backup this external hard drive using the preferences given to me?
Or, if, by default, this drive is being backed up, where are these settings listed?
Many thanks
Tim

I have a 3TB TM with a 500GB external mac formatted hard drive connected via USB.
Is the 500GB connected to the TC or the Mac?? I am lost but as I read that sentence the USB drive is plugged into a TC.. and the TM is a typo.. Time Machine is software on your computer.. Time Capsule is a hardware router with a hard disk,, in your case 3TB.
TM cannot backup network drives.. plug the 500GB into the Mac and it will automatically list in exclude on TM.. you have to remove it from the exclude list to be included.. it is kind of thinking a solid state physicist would use.. holes instead of electrons.

Imac freezing while connecting external hard drive

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