[ubuntu] File Transfer Hangups & crashes

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http://ubuntuforums.org – I'm running 13.04 and really frustrated. I'm trying to do a pretty simple thing, copy files from documents to an exteranal WD USB hard drive. Tried to copy a big directory last night, approx 13K files, 35GB, worked fine until it hit exactly 12,000 files transferred -- then it stopped. Just froze. Let it sit for two hours and no change. File transfer windows won't close fully (still see progress bar overlay on file icon). Other programs won't function or load requiring hard reset with power button. This morning, just tried transferring 1,296 files for a total of just 1.8 GB. I hung up again, (Hardware)