fedora9安装时找不到硬盘

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哪位大侠,帮帮我,我以的电脑这前装FEDORA7都顺风顺水,但自从下了FEDORA9后,怎么也装不上去,64位版本的也试过.(电脑:945主板,1G内存,250GSATA西数)以为是电脑问题,后来重新买了台电脑,(G31主板,2G内存,320G日立SATA硬盘)也装不上,总提示找不到硬盘. 我敢肯定我的光盘没问题,虚拟机装就没问题.请大家看看是怎么回事,谢谢!

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check your iso md5sum. Have a look at kernel parameters supplied by the installation iso.  Can you partition the disk before installation? I mean does fedora mount your disk?