[ubuntu] Using pen drive as regular hard disk - Ok? or Not ok ?

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http://ubuntuforums.org – My laptop hard disk got crashed. But until I replace I want to do my home works. So I installed Ubuntu 11.10 on 16GB Kingston DT101 G2 pen drive. My question is, using my pen drive as my regular disk for 1 or 2 weeks is that OK ? Will I get any problems in my pen drive? After I replace my hard disk can I use that pen drive as normal ( just assume I will use my laptop at least 12 hours per day). Also, I have 500GB Toshiba External hard disk. Do I need to use that external hard disk is that better? or I can I use my pen drive?. Since now days everybody using the pen drive to install Linux , (Hardware)