Copying music failed, unknown error (-50)

Trying to move my library from one external hard drive to another external hard drive. Did it by going to Preferences-Advanced and changing the drive/folder location and then going to Advanced-Consolidate Library. All seemed to be going ok and then the process stopped (about 40% done) with the error "copying music failed. An unknown error has occurred (-50)". I've searched the forums and Google without luck. There was some mention of filenames. However, the songs with the longest pathname made it over to the new drive just fine. So it's not length. A quick check in iTunes using "GetInfo" showed some songs on the old drive and some on the new drive. At what point do these get updated in the consolidation process? As they are getting copied (one song at a time) or all songs before the copying process starts???
For the moment, I have changed the drive back and consolidated the library back to the original drive and that seems to be ok. Still want to move the library but don't know what caused it to stop the first time so thought I'd ask here before trying again.
Thanks.

hi usablues!
hmmmm. i've been seeing this particular kind of "anomalous" (-50) off and on since 4.9.
this is experimental. but we've been seeing different sorts of strange unknown error codes under similar circumstances when antivirus or antispyware is interfering with itunes' ability to read the library files.
... so ... can you get a consolidate to go through properly if you have your antivirus/antispyware switched off?
love, b

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I found this link about error numbers here ...
http://www.koders.com/c/fid53B3BE16088320EE31E67B12F901FE3FB9D1F480.aspx
DennisinChicago wrote:
I want to Consolidate ... I immediately get an error message that says "Copying Music failed. An unknown error occurred (-51).
Error # 51 means that the Buffalo Terastation NAS is unreachable on your local network.
RRutter wrote:
"Copying Music failed. An Unknown error occured (-48).
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... knows how to fix it?
Look at this Apple Article about how to Consolidate the iTunes Library ... http://support.apple.com/kb/HT1449
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Copying music failed, unknown error (-50)

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