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Recently I've had problems when ejecting a Seagate SRD0SP0 USB 2.0 hard drive from my Macbook. It has two partitions, one is my Time Machine backup, the other an ExFAT partition for media. There is also a sparse bundle disk image.

When ejecting, diskarbitrationd consumes 100% of one CPU for about 10-15 minutes until finally ejecting. Console contains things like...

1/2/13 6:02:32.097 PM fseventsd[67]: could not open <</Volumes/ExFAT/.fseventsd/fseventsd-uuid>> (No such file or directory)
1/2/13 6:02:32.097 PM fseventsd[67]: log dir: /Volumes/ExFAT/.fseventsd getting new uuid: B0B6D688-5CB1-4236-BA7E-BB90E19D3C10
1/2/13 6:07:58.336 PM fseventsd[67]: Events arrived for /Volumes/DiskImage after an unmount request! Re-initializing.
1/2/13 6:07:58.336 PM fseventsd[67]: creating a dls for /Volumes/DiskImage but it already has one...
1/2/13 6:08:03.755 PM fseventsd[67]: Events arrived for /Volumes/ExFAT after an unmount request! Re-initializing.
1/2/13 6:08:03.755 PM fseventsd[67]: creating a dls for /Volumes/ExFAT but it already has one...
1/2/13 6:08:04.227 PM mds[57]: (Error) LSOF: File '/Volumes/ExFAT' (fd=11) left open on device 16777222
1/2/13 6:15:53.927 PM SystemUIServer[302]: Error getting disk for path /Volumes/Backup: Couldn't stat disk
1/2/13 6:16:08.033 PM SystemUIServer[302]: Error getting disk for path /Volumes/Backup: Couldn't stat disk

I've changed the volume names to be more obvious which is which.

I've run Disk First Aid on both partitions. This is OS X 10.8.2 and was cleanly installed a few weeks ago. I have no special software running but Sophos An

Any ideas what the problem might be or how I might go about diagnosing?

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