Error code -36 when copying large file

Aperture (Apple's pro photo software) stores all of it's data (pictures, metadata, etc) in what appears to be a large file called the Library. In fact, it's a large folder with all of the contents hidden so you don't mess around with it. I back this file up periodically to both an internal and external drive. After a hard drive failure and recreating my whole machine, everything seemed fine and Aperture is working normally. I have tried to drag copy my Aperture Library (rebuilt from my Aperture vault, a back up file created by Aperture) file to my internal second drive, a process that takes about 2 hours (300 Gb). The drive I'm copying to has over 451 GB available and was freshly formatted during this rebuild process. A little more that half way through the drag copy I get the following message.
"The Finder cannot complete the operation because some data in “Aperture Library” could not be read or written, (Error code -36)"
Here's what I've done to so far.
1. Aperture has a function to repair permissions and rebuild the file, done both several times.
2. I found (by looking at all 20,000 plus pictures) some corrupt picture files and deleted them, then repeted step one.
3. Tried a duplicate file on the same drive, same error.
Thoughts? Help? I can't find anything on a Mac OS error -36.
By the way, I'm running Mac OS 10.5.8 and Aperture 2.1.4 on a Quad Core G5.

This what it means:
Type -36 error (I/O Errors (bummers)
This file is having difficulty while either reading from the drive or writing to the drive. The file
may have been improperly written data to the drive or the hard drive or disk may be damaged.
This is almost always indicative of a media error (hard error on the disk). Sometimes (rarely) it is transient.
Solutions: Try copying the file to another drive. Use a disk recovery software, such as Disk First Aid to examine the disk. You can try rebooting with all extensions off. Once in a while this will allow you to read the data. The file in question should be restored from a backup that was stored on a different disk. Regular backups can reduce the time to recover from this error.

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