Time Machine error -1, cannot access sparsebundle (but not a NAS or WD problem)

Hello, this is my first post here, so I'll try to make it a good one!
I've been wrestling with this problem ever since I bought my Core i7 iMac (SSD + 1TB HD) over a year ago. I have not gotten Time Machine to work during that whole time. Well, I got it to work backing up directly to my internal HD, but that was just a test; it's not what I want. So let me describe this in the most clear and consise way I can:
I want the Time Machine disk to be my Synology NAS. I've configured a share on it correctly. I have an older iMac running SnowLeopard backing up to the same share on the NAS with TimeMachine successfully. But, my iMac won't do it. Whether I create the sparsebundle manually, or I let TimeMachine create it, it always gives the same "error -1". I wrote a more detailed account of my symptoms here (my message is the reply), when I thought this was a NAS-specific issue.
New development: This is not a NAS issue. I found that out by trying an experiment:
First, I tried to back up my SSD using Time Machine to my internal 1TB disk - I selected the "1 TB Secondary Disk" as the Time Machine disk. I initiated the backup, and it worked fine, putting the time machine backup in the "Backups.backupsdb" directory structure at the root of the drive. I then turned off Time Machine and "removed" the 1TB as my backup disk.
Then, I created a sparsebundle at the root of the drive using this command:
hdiutil create -size 150g -fs HFS+J -volname "Time Machine" NAME_xxxxxxxxxxxx.sparsebundle
(where the "xxxxxxxxxxxx" is my ethernet MAC address). I then selected the "1 TB Secondary Disk" as the Time Machine disk again. Time Machine found my sparsebundle and started working with it... and got "error -1"! So even on a local drive, when Time Machine tries to use a sparsebundle for backing up, it still doesn't work.
Now, I have the console log entries that were written during the Time Machine backup attempt:
1/1/13 12:53:59.511 PM com.apple.backupd[4460]: Starting manual backup
1/1/13 12:54:00.780 PM com.apple.backupd[4460]: Renaming /Volumes/1 TB Secondary Disk/NAME_3c07540fdd8c.sparsebundle to /Volumes/1 TB Secondary Disk/iMac.sparsebundle
1/1/13 12:54:00.871 PM com.apple.backupd[4460]: detach: could not open /dev/disk4
1/1/13 12:54:01.260 PM com.apple.backupd[4460]: Resizing backup disk image from 161.06 GB to 999.76 GB
1/1/13 12:54:02.940 PM com.apple.backupd[4460]: Waiting 60 seconds and trying again.
1/1/13 12:55:03.378 PM com.apple.backupd[4460]: Resizing backup disk image from 161.06 GB to 999.76 GB
1/1/13 12:55:06.013 PM com.apple.backupd[4460]: Waiting 60 seconds and trying again.
1/1/13 12:56:06.619 PM com.apple.backupd[4460]: Resizing backup disk image from 161.06 GB to 999.76 GB
1/1/13 12:56:09.255 PM com.apple.backupd[4460]: Giving up after 3 retries.
1/1/13 12:56:19.263 PM com.apple.backupd[4460]: Backup failed with error: 21
1/1/13 12:56:19.265 PM com.apple.backupd[4460]: [SnapshotUtilities mountPointForVolumeRef] FSGetVolumeInfo returned: -35
1/1/13 12:56:19.265 PM com.apple.backupd[4460]: Failed to eject volume (null) (FSVolumeRefNum: 0; status: -35; dissenting pid: -1)
1/1/13 12:56:19.265 PM com.apple.backupd[4460]: Failed to eject Time Machine disk image: /Volumes/1 TB Secondary Disk/iMac.sparsebundle
So, here I see it tries to resize the sparsebundle to the full volume size, and fails. I don't think I want it to do this resize, because I don't want it to fill up my whole NAS share. I searched and found this post, which specifies how to set the permissions in the sparsebundle such that it won't be resized. I followed those instructions with a new sparsebundle, and see the same problem... tries to resize, and fails.
I do not have Western Digital software installed and never have.
I've tried everything on this page.
It seems like the attempt to resize is corrupting the sparsebundle. Before starting the backup, I can mount the sparsebundle and manually copy files to it. After attempting the backup, I can mount the sparsebundle, but I cannot copy anything to it manually. Note that I can mount the sparsebundle that the MacBook Pro uses for Time Machine, and manually copy files to and from it (in other words, the correct SnowLeopard configuration does allow manual copying).
I have tried repairing the sparsebundle using the Disk Utility, which restores the ability to manually copy files to it, but Time Machine once again renders it unwriteable when it attempts to back up.
Anyone know of anything else I can try? Thank you so much!
Dan

Yeah, sorry about the broken link. I noticed that link wasn't working after I replied, then I edited my earlier reply. Also, yes, copying the files was just meant as a test; I created new clean sparsebundles for other tries.
Anyway, I'm not too worried about the resizing for now; first things first, let's just get Time Machine working with a sparsebundle at all.
I don't know how to make Time Machine create its own sparsebundle on my local drive; if there isn't a manually created sparsebundle at the root, it just puts everything in the "Backups.backupsdb" directory structure without a sparsebundle. However, it of course does create its own sparsebundle when I point it to my NAS share (as I understand it, Time Machine knows the NAS filesystem doesn't support everything it needs, so it creates the sparsebundle to emulate the correct filesystem). As I have always gotten the same "error -1" when using the NAS share as I did when using the local sparsebundle, I was assuming the same problem was happening in both cases... but now I've checked the console log after doing a backup attempt on the NAS share, and I see different stuff:
1/2/13 9:21:12.000 PM kernel[0]: AFP_VFS afpfs_mount: /Volumes/TM Backups, pid 9615
1/2/13 9:21:12.000 PM kernel[0]: AFP_VFS afpfs_mount : succeeded on volume 0xffffff8148d5b008 /Volumes/TM Backups (error = 0, retval = 0)
1/2/13 9:21:13.000 PM kernel[0]: AFP_VFS afpfs_unmount: /Volumes/TM Backups, flags 0, pid 9624
1/2/13 9:21:13.000 PM kernel[0]: AFP_VFS afpfs_unmount : We are the last mnt/sbmnt using volume /Volumes/TM Backups 0xffffff8148d5b008
1/2/13 9:21:13.000 PM kernel[0]: AFP_VFS afpfs_unmount : We are the last volume using socket /Volumes/TM Backups 0xffffff8148d5b008
1/2/13 9:21:49.647 PM com.apple.backupd[9623]: Starting manual backup
1/2/13 9:21:49.737 PM com.apple.backupd[9623]: Attempting to mount network destination URL: afp://[email protected]/TM%20Backups
1/2/13 9:22:00.060 PM com.apple.backupd[9623]: Mounted network destination at mount point: /Volumes/TM Backups using URL: afp://[email protected]/TM%20Backups
1/2/13 9:22:00.000 PM kernel[0]: AFP_VFS afpfs_mount: /Volumes/TM Backups, pid 9630
1/2/13 9:22:00.000 PM kernel[0]: AFP_VFS afpfs_mount : succeeded on volume 0xffffff8148ffb008 /Volumes/TM Backups (error = 0, retval = 0)
1/2/13 9:22:15.323 PM com.apple.backupd[9623]: Creating disk image /Volumes/TM Backups/iMac.sparsebundle
1/2/13 9:22:46.397 PM com.apple.backupd[9623]: Failed to hide extension on /Volumes/TM Backups/iMac.sparsebundle, error: Error Domain=NSCocoaErrorDomain Code=4 "The file “iMac.sparsebundle” doesn’t exist." UserInfo=0x7fe881407700 {NSURL=file://localhost/Volumes/TM%20Backups/iMac.sparsebundle/, NSFilePath=/Volumes/TM Backups/iMac.sparsebundle, NSUnderlyingError=0x7fe8814073c0 "The operation couldn’t be completed. No such file or directory"}.
1/2/13 9:23:10.209 PM com.apple.backupd[9623]: Failed to eject volume /Volumes/TM Backups (FSVolumeRefNum: -153; status: -47; dissenting pid: 0)
1/2/13 9:23:10.210 PM com.apple.backupd[9623]: Waiting 60 seconds and trying again.
1/2/13 9:24:10.241 PM com.apple.backupd[9623]: Network destination already mounted at: /Volumes/TM Backups
1/2/13 9:24:56.305 PM com.apple.backupd[9623]: Failed to eject volume /Volumes/TM Backups (FSVolumeRefNum: -153; status: -47; dissenting pid: 0)
1/2/13 9:24:56.305 PM com.apple.backupd[9623]: Waiting 60 seconds and trying again.
1/2/13 9:25:56.326 PM com.apple.backupd[9623]: Network destination already mounted at: /Volumes/TM Backups
1/2/13 9:26:40.171 PM com.apple.backupd[9623]: Failed to eject volume /Volumes/TM Backups (FSVolumeRefNum: -153; status: -47; dissenting pid: 0)
1/2/13 9:26:40.171 PM com.apple.backupd[9623]: Giving up after 3 retries.
1/2/13 9:26:50.177 PM com.apple.backupd[9623]: Backup failed with error: 21
1/2/13 9:26:50.178 PM com.apple.backupd[9623]: [SnapshotUtilities mountPointForVolumeRef] FSGetVolumeInfo returned: -35
1/2/13 9:26:50.178 PM com.apple.backupd[9623]: Failed to eject volume (null) (FSVolumeRefNum: 0; status: -35; dissenting pid: -1)
1/2/13 9:26:50.178 PM com.apple.backupd[9623]: Failed to eject Time Machine disk image: /Volumes/TM Backups/iMac.sparsebundle
So... looking through this, it does some mounting, which all works fine, then it does a create sparsebundle, which appears to work fine, but then it tries to "hide extension", but it can't because it can't find the sparsebundle that it supposedly created. Then it tries three times to eject the NAS share ('TM Backups'), and fails, and gives up. At this time I get the "error -1" pop up on my monitor, and check the NAS share (using the disk utility on the NAS managment page), and sure enough there is the sparsebundle "iMac.sparsebundle". So why does it create it, but then not be able to use it?
Skiing tomorrow, must sleep now. :-)

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Message was edited by: kryzma

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Jan 30 09:44:44: --- last message repeated 1 time ---
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