Trouble installing Lion due to partition error

Hi everyone,
So I don't know a whole lot about computers, and I have had my macbook for a couple years now and decided to install Lion last night. After I downloaded it, I got an error message saying that it could not be installed and I needed to change my HD's partitioning to GUID. The internal HD I have in my mac now I installed myself, and I must have accidentally clicked apple partition map instead of GUID when I installed it, which didn't cause a problem until now (my macbook has an intel processor). So i backed up everything on my HD to an external HD using carbon copy, hoping that I would just be able to reformat/partition my internal HD correctly and move everything back onto it from my external drive. I booted my computer using the external drive, and tried to repartition using disk utility, but I keep getting a partition error message that tells me the disk cannot be unmounted. I got the same message when I tried just erasing the disk first. Anyone know how I can fix this?
Thanks, and Happy Holidays!!

Try starting from your Snow Leopard Install disc.

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Aug 11 10:00:27 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: donor disk's storage system is simple so it itself will be the donor
Aug 11 10:00:27 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: normalized donor: logical=0x7fec5fb00518=disk0s2=Macintosh HD=(iflvuuid=(null)) physical=0x10714bcb0=disk0s2=Macintosh HD=disk0s2 storage=(null)
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Aug 11 10:00:27 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: donor's whole-disk=0x10714bc10=disk0
Aug 11 10:00:27 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: ensured target and donor are reasonable sizes (>2GB) to support a full OS installation
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Aug 11 10:00:28 localhost OSInstaller[388]: Checking Journaled HFS Plus volume.
Aug 11 10:00:28 localhost OSInstaller[388]: Checking extents overflow file.
Aug 11 10:00:28 localhost OSInstaller[388]: Checking catalog file.
Aug 11 10:01:02 localhost OSInstaller[388]: Checking multi-linked files.
Aug 11 10:01:03 localhost OSInstaller[388]: Checking catalog hierarchy.
Aug 11 10:01:34 localhost OSInstaller[388]: Checking extended attributes file.
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Aug 11 10:01:46 localhost OSInstaller[388]: Checking volume information.
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Aug 11 10:01:46 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: doing check if there is a WindowsOS at part#4 on phy's whole=0x10714bc10=disk0
Aug 11 10:01:46 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: if WINOS on partID=4 then caution; isWindowsOSonPart4=0
Aug 11 10:01:46 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: at DoneCheckingDontPushWindowsOSPast4
Aug 11 10:01:46 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: doing test of boot.ini file(s) updatability on phy's whole=0x10714bc10=disk0
Aug 11 10:01:46 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: done test boot.ini updatability; err=ShouldAbort=0
Aug 11 10:01:46 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: was .dmg already attached/mounted = 0
Aug 11 10:01:46 localhost OSInstaller[388]: Attaching disk image /Volumes/Mac OS X Install DVD/BaseSystem.dmg
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: done attach; err=0
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: got VolMP=/Volumes/Mac OS X Base System 1 VolUDS=0x10714ba10=disk18s3=Mac OS X Base System WholeUDS=0x10714bab0=disk18
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: ensured img's attached vol is an OSX system
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: calc requiredFileSpaceForRecoveryFilesULL from file sizes, also is further preflight that files exist
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: start with 0 B
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: peek src=/Volumes/Mac OS X Base System 1/System/Library/CoreServices/boot.efi err=(null)
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add 858800 B
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: peek src=/Volumes/Mac OS X Base System 1/System/Library/Caches/com.apple.kext.caches/Startup/kernelcache err=(null)
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add 23992189 B
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: peek src=/Volumes/Mac OS X Install DVD/BaseSystem.dmg err=(null)
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add 451307798 B
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: allocating kEstimatedBootDotPList_LogicalSizeULL
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add 16384 B
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: peek src=/Volumes/Mac OS X Base System 1/System/Library/CoreServices/SystemVersion.plist err=(null)
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add 475 B
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: peek src=/Volumes/Mac OS X Base System 1/System/Library/CoreServices/com.apple.recovery.boot/PlatformSupport.plist err=(null)
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add 2245 B
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: doing BaseSystem.dmg's ChunkList
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: peek src=/Volumes/Mac OS X Install DVD/BaseSystem.chunklist err=(null)
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add 1876 B
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: CALC result phase 1 (after adding up logical file sizes in dmg + expected to create ourselves) requiredFileSpaceForRecoveryFilesULL=476179767 =Sbydiv=930038 =Mbydiv=454
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add no provision for existing files in booter (will only be adding fixed iomedia-alloc-for-BootRoot later below)
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: CALC result phase 2 (after considering ExistingIfAny booter volume files with physical on-disk rounded up to alloc block sizes) requiredFileSpaceForAllFilesULL=476179767 =Sbydiv=930038 =Mbydiv=454
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: create desiredMinRecoveryDiskIOMediaSizeULL; start with requiredFileSpaceForAllFilesULL
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: add kConvertFromLogicalSizeToIOMediaSize_ULL=16777216
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: CALC result phase 3 (converted to iomedia desired size) desiredMinRecoveryDiskIOMediaSizeULL=492956983 =Sbydiv=962806 =Mbydiv=470
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: after adding allowance for BootRoot kBootRootEtc_IOMediaSizeULL=134217728 desiredMinRecoveryDiskIOMediaSizeULL=627174711
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: CALC result phase 4 (after adding BootRoot iomedia allocation) desiredMinRecoveryDiskIOMediaSizeULL=627174711 =Sbydiv=1224950 =Mbydiv=598
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: after applying kIfNewRecoverySystemMakeEntireBooterAtLeast_IOMediaSizeULL=650000000
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: CALC result phase 5 (after applying minimum) desiredMinRecoveryDiskIOMediaSizeULL=650000000 =Sbydiv=1269531 =Mbydiv=619
Aug 11 10:01:49 localhost diskmanagementd[392]: DM ..T-[DMToolBootPreference ensureRecoveryPartitionForVolume:]: doing find/create/resize recoveryDisk
Any suggestions greatfully accepted. Thanks.
Allan

Allan,
1. Do you have a Boot Camp partition on the drive?
2. Do you have any additional partitions on the drive?
In some cases either of the above can result in the Recovery HD partition failing to install. Something to do with not being able to resize the last partition on the drive.
I think that if the drive has been fairly full then there could be some fragmented files that result in the partitioner failing to find a contiguous block for the recovery partition. Sort of the same problem that can arise when trying to create a Boot Camp partition.
In any event you can create your Recovery partition by resizing the drive on your own using Disk Utility. Make a 1.2 GB partition at the end of the drive by shrinking the last partition by that amount then adding a new partition. Download the Lion Recovery Disk Assistant 1.0 and use it to create the Recovery HD in the newly added partition. You can actually use the Recovery Disk Assistant to create a Recovery HD on any device including a small USB flash drive.

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Trouble installing Lion due to partition error

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