How to resolve errors (-50 and -8058) when moving Time Machine backups to new disk?

I'm trying to move my Time Machine backups (about 600GB total) to a new external hard drive. I started the process last night, but after an hour or so received two errors, each repeated multiple times:
"The operation couldn't be completed because an unexpected error occurred (error code -8058)."
"The operation couldn't be completed because an unexpected error occurred (error code -50)."
I opted to cancel the file transfer. I looked up the error codes but I'm still not sure what they mean. I found an old support article about error code -50 (Mac OS X 10.1: "Error Code -50" Alert Appears When Copying Files From a Remote Disk) and an old support article about error code -8058 that doesn't appear to be entirely relevant to my issue (Mac OS X 10.4: Error -8058, unable to eject when trying to copy a disc in Finder). I've also found a number of Support Community discussions, none of which are particularly helpful.
Questions:
What do these two error codes mean? Are the files that cause these errors somehow corrupt?
If I click "Okay" when the error dialog appears, are the files that are causing the errors transferred or are they omitted from the transfer?
If I transfer the files and click "Okay" when the errors appear, or if I use Terminal and cp -R as suggested in Mac OS X 10.1: "Error Code -50" Alert Appears When Copying Files From a Remote Disk, will I have trouble recovering files from the new backup disk?
Do I need to verify/repair permissions on the original Time Machine disk before attempting the transfer?
Is there some other method I should use (e.g. Terminal instead of Finder) to transfer the backups?
Details:
MacBook Air
Mac OS 10.8.5
Both the old and new Time Machine disks are formatted Mac OS Extended (Journaled)

The two drives are handled as separate drives, even if they have the same name.
In essence, the old backups are from a drive that's no longer connected; see #E3 in the Time Machine - Troubleshooting *User Tip,* also at the top of this forum.

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How to resolve errors (-50 and -8058) when moving Time Machine backups to new disk?

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