SATA HDD not detected

I am using Windows XP Professional edition sp2. I have a 80 GB sata hard drive and a 160 GB sata hard drive. The 80 GB one is detected when i boot up the system and also for some time when the system is up and running. Then when i try to access something on it, Windows stops detecting the drive and it is not visible even in device manager. Any help on how to fix this would be appreciated.

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See this support link for more help : http://support.microsoft.com/kb/313348
http://support.microsoft.com/kb/946480