Time Machine Causes Insomnia - can't put to sleep

With time machine running and the backup disk mounted (iOmega 500), if I try to put the machine to sleep manually I get an alarming message to the effect that I have dismounted the disk without logically ejecting it first, with possible dire consequences. And the machine stays awake. Same thing if I repeat.
Is this a bug? Workaround?
I also note, as do others, that the machine will not go to sleep all by itself (like overnight) with TM up and running. And backups faithfully show up on the disk every hour all night long.
Is the Time Machine backup program causing sleep deprivation? Should it?

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    Kernel version:
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    com.apple.security.sandbox 1
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    com.apple.nke.applicationfirewall 2.1.11
    com.apple.driver.AppleIntelCPUPowerManagement 105.13.0
    com.apple.driver.DspFuncLib 1.9.9f12
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    Model: Macmini3,1, BootROM MM31.00AD.B00, 2 processors, Intel Core 2 Duo, 2.26 GHz, 4 GB, SMC 1.35f1
    Graphics: NVIDIA GeForce 9400, NVIDIA GeForce 9400, PCI, 256 MB
    Memory Module: global_name
    AirPort: spairportwireless_card_type_airportextreme (0x14E4, 0x90), Broadcom BCM43xx 1.0 (5.10.131.36.9)
    Bluetooth: Version 2.4.0f1, 2 service, 12 devices, 1 incoming serial ports
    Network Service: AirPort, AirPort, en1
    Serial ATA Device: Hitachi HTS725050A9A364, 465.76 GB
    Serial ATA Device: OPTIARC DVD RW AD-5670S
    USB Device: Keyboard Hub, 0x05ac (Apple Inc.), 0x1006, 0x26400000
    USB Device: Microsoft 3-Button Mouse with IntelliEye(TM), 0x045e (Microsoft Corporation), 0x0040, 0x26430000
    USB Device: Apple Keyboard, 0x05ac (Apple Inc.), 0x0220, 0x26420000
    USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x04500000
    USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000
    USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8216, 0x06110000

    holbri wrote:
    When time machine is finishing a backup, the grey curtain comes down and I must shut down computer. I have tried to repair sparsebundle but I do not receive any details to see if the bundle is corrupt.
    Sometimes when you repair a sparse bundle, the messages aren't shown in the center panel. Click the Logs icon in the toolbar, or select +Window > Show Log+ in the menubar.
    The messages for each "run" are separated by a row of asterisks, so you can look back, too.
    I have pasted below the kernel panic details. Any suggestions to correct time machine so I can use again for backups?
    panic(cpu 0 caller 0x4207e0): "hfs_getnewvnode: bad ca_blocks (too small)"@/SourceCache/xnu/xnu-1504.9.37/bsd/hfs/hfs_cnode.c:706
    Bad blocks sounds like a problem with the HD. If the repair finds and fixes things, try again.
    If that doesn't help, make an appointment at your local Apple Store: http://www.apple.com/retail/geniusbar/
    or call AppleCare and report your situation.
    Note that Time Capsules are warranted for one year, but if you purchased AppleCare for a Mac within 2 years of the TC, the TC is covered, too.

  • I can't install OSX 10.6.3 as it says HD used for Time Machine backup, I can't install OSX 10.6.3 as it says HD used for Time Machine backup

    I've just received Snow Leopard disc and tried to install it but nothign is ever that easy.  It says that hard drive in use for Time Machine backup so can't install.  I've never used Time Machine and settings appear to confirm that.  I don't want to set it to restore and lose everything and have to install it again so not sure what to do.  Can anyone advise me

    Jane Doubleday wrote:
    I've got an Intel mac otherwise I wouldn't have bought Snow Leopard.
    Please update your profile info, then Jane - we can only go on the info you give us.
    Glad you're sorted though 

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