Problem Stopping Finder Copy to USB Flash Drive

I was attempting to copy my Pictures folder (about 4.5 GB) to a USB flash drive. It seemed to copy OK until it got about a third of the way through and then stalled. I selected the stop copy on the dialog box but nothing happened and the copy dialog box just became grayed out. I could not eject the flash drive either. When I used the Command-Option-Escape key combination, I was given the option to relaunch the Finder, which I selected but then was just left without the ability to use the Finder at all. I resorted to pressing the power button to shutdown and then restarted and was able to eject the flash drive.
Is the Finder capable of copying a file of this size? What causes Finder to freeze up on a copy operation? How else could I have stopped the Finder copying process once it hung? Thanks.
Regards,
Steve M.

Before trying the Safe Boot, I tried a different experiment. I just tried using the Finder to Duplicate the Pictures folder. It duplicated fine without problems. Then I repaired permissions on my internal disk and did a repair disk on my flash drive (no repairs needed). Then I tried to copy my Pictures folder to my flash drive again and the process hung right about at 600 MB of data transferred.
I know I'm using USB 1 and that's a slow connection. My previous flash drive was only a 1 GB so I typically never transferred very large files before. I think Finder is working as it should and that I am bumping up against some problem with USB 1 transfers or with the flash drive itself (it is formatted Mac OS extended). I'm using a powered USB hub to plug the drive into and I know the hub is working fine. I guess I could try connecting directly to a USB port on the iMac to see if that helps.
Regards,
Steve M.

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Thank You.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Gemini02
I work on behalf of HP

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