Ann Read this article before, http://www.osyunwei.com/archives/2307.html, and then began.
First download UltraISO, download the website, the CentOS ISO image to write to the U disk.
After not listening to the above article on the net text, what deleted files, but also the ISO file copy into, inconceivable.
Then insert the U-disk into my old XPS machine, start the machine, and press F12 to select the U-disk.
Then the CentOS installation option came out, and after selecting the language to continue, there was asked what type of media the installation image is (what kind of medium contains the installation image?), I chose hard disc, and then asked which partition to mount , my choice of/dev/sdb4, this should be refers to my plug in the U disk. This step is the same as the above Web text, here is very accurate.
It all went smoothly until the installation was complete.
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Installing CentOS for the first time with a USB stick