Copying files either very slow or doesn't work at all

I've tried copying files from a DVD to an external drive, and from one external drive to another, and I've been running into troubles on my Mac Pro, namely, I get an error code 36 (corrupted files) and the copying process hangs, requiring me to reboot. However, I was able to copy the files from the DVD to my laptop HD, so I don't think that corrupt files is the problem. After rebooting my Mac Pro, I was able to copy files from one external drive to another, but it was incredibly slow (about 1GB per hour), and I was still unable to copy files from the DVD to an external drive. I've verified all the disks with Disk Utility, and I've repaired disk permissions on my Mac Pro HD but apparently need to re-run since when I verify permissions again, I'm still getting a lot of errors or comments like "Warning: SUID file "usr/bin/rlogin" has been modified and will not be repaired". Scanning my Mac Pro HD for viruses, quite a few files are coming up with the comment "did not have permission to open the file." Other than continuing to repair disk permissions, does anyone have suggestions about what might be causing this and/or on possible next steps?

A little further info - I checked permissions and I have permission to copy the files in question. Also, it seems that most of the errors that pop up when I verify permissions are of the type that can safely be ignored, according to Apple -- I'll go through the list later and cross-check them to make sure that they're all ignore-able, but thats what they appear to be.

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http://support.apple.com/kb/ht1766
iTunes: About iOS Backups
http://support.apple.com/kb/ht4946
Use iTunes to Restore your iOS Device to Factory Settings
http://support.apple.com/kb/ht1414
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keithfrommariettaOct 12, 2014 3:25 PM Re: IPAD2 very slow after IOS 8 upgrade
Re: IPAD2 very slow after IOS 8 upgradein response to pacoKAS
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