External Hard Drive ejects during Time Machine Backup

I've read through all the troubleshooting pages that I thought had anything to do with this problem, but none of my error messages seemed to match. This is my first backup with Time Machine onto my external hard drive, and it never gets past about 60GB before deciding that the drive has improperly ejected itself and aborting the backup. The error message from my Time Machine Buddy is below:
Starting standard backup
Backing up to: /Volumes/Untitled/Backups.backupdb
Ownership is disabled on the backup destination volume.  Enabling.
Backup content size: 147.2 GB excluded items size: 5.1 GB for volume Macintosh HD
No pre-backup thinning needed: 170.49 GB requested (including padding), 930.54 GB available
Waiting for index to be ready (101)
Copied 56.0 GB of 142.1 GB, 112101 of 886988 items
Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Device not configured
Error: (-50) SrcErr:NO Copying /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ge ms/net-ssh-1.1.4/lib/net/ssh/proxy/errors.rb to /Volumes/Untitled/Backups.backupdb/Eugenio Vargas Computer/2011-05-17-161101.inProgress/E6F5C3CB-75B8-41C4-B52E-138235EB4B34/Maci ntosh HD/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ gems/net-ssh-1.1.4/lib/net/ssh/proxy
Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Device not configured
Error: (-50) SrcErr:NO Copying /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ge ms/net-ssh-1.1.4/lib/net/ssh/proxy/http.rb to /Volumes/Untitled/Backups.backupdb/Eugenio Vargas Computer/2011-05-17-161101.inProgress/E6F5C3CB-75B8-41C4-B52E-138235EB4B34/Maci ntosh HD/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ gems/net-ssh-1.1.4/lib/net/ssh/proxy
Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Device not configured
Error: (-50) SrcErr:NO Copying /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ge ms/net-ssh-1.1.4/lib/net/ssh/proxy/socks4.rb to /Volumes/Untitled/Backups.backupdb/Eugenio Vargas Computer/2011-05-17-161101.inProgress/E6F5C3CB-75B8-41C4-B52E-138235EB4B34/Maci ntosh HD/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ gems/net-ssh-1.1.4/lib/net/ssh/proxy
Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Device not configured
Error: (-50) SrcErr:NO Copying /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ge ms/net-ssh-1.1.4/lib/net/ssh/proxy/socks5.rb to /Volumes/Untitled/Backups.backupdb/Eugenio Vargas Computer/2011-05-17-161101.inProgress/E6F5C3CB-75B8-41C4-B52E-138235EB4B34/Maci ntosh HD/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ gems/net-ssh-1.1.4/lib/net/ssh/proxy
Indexing a file failed. Returned 200 for: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ge ms/net-ssh-1.1.4/lib/net/ssh/proxy, /Volumes/Untitled/Backups.backupdb/Eugenio Vargas Computer/2011-05-17-161101.inProgress/E6F5C3CB-75B8-41C4-B52E-138235EB4B34/Maci ntosh HD/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/ gems/net-ssh-1.1.4/lib/net/ssh/proxy
Aborting backup because indexing of file failed.
Other details:
My external drive is a WD 1TB drive. The partition for the Time Machine Backup is formatted as Mac OS Extended (Journaled), as is my Macintosh HD. The Partition Map Scheme on the external drive is GUID Partition Table.
I have tried reformatting the external drive for good measure, but this doesn't seem to solve any problems. I also tried searching for the file that the error message says NO Copying for (/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/g ems/net-ssh-1.1.4/lib/net/ssh/proxy/...) but I'm unable to find the files. I can get as far as /System/Library/Frameworks, but can find no folder in Frameworks titled Ruby.
Please help.

The Ruby folder is probably hidden. That is why you don't see it.
You may want to add System/Library/Frameworks to the exempted sync list until you can figure out which file is causing this. You can do this by opening Time Machine Preferences ( > System Preferences > Time Machine) and clicking on Options…
After that click the small + key and browse to the folder you want to exempt from the sync. In your case: Macintosh HD > System > Library > Frameworks
Next hit the exclude button with the Frameworks folder highlighted.
Try your backup again and see if it fails.

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