Why is my external hd & flash drive locking up when transferring .m4a?

Why is my external hd & flash drive locking up when transfering .m4a?
I recently upgraded my software to 10.6.3 on my iMac Intel Core 2 Duo. When I transfer movie files specifically to my USB flash drive and external hard drives, they now cause my imac to freeze. If the file size is larger than 500K I experience this problem.
What is the issue?

They are formated as MS-DOS Fat
Thanks

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