USB介面傳輸介面也不可能會有多快的\
好像每秒傳輸有30MB以上就不錯了
不過還好你資料量還不算很多,頂多快40g
貼上幾個文章連結,或許你可看看
http://www.pcgamma.com/showthread.php?t=11540
http://www.mobile01.com/print.php?f=297&t=663550&p=1
http://www.heyshopping.com/report_detail.asp?id=394
http://www.mobile01.com/topicdetail.php?f=297&t=523966&p=1
http://www.mobile01.com/topicdetail.php?f=159&t=54878
http://www.mobile01.com/topicdetail.php?f=297&t=135235&p=1&cache=0