It would have to be software raid, but you can run two hard drives with newer dell laptops. Dell has a $30 carrier that allows you to use a hard drive in the media bay. For my inspiron 8200 the part number is 29MFN for a 9.5mm drive. For a drive, look at the IBM 40GNX with 8mb of cache. There are lots of discussions on this at dell's forums at delltalk.us.dell.com in the inspiron hard drive forum.
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It would have to be software raid, but you can run two hard drives with newer dell laptops. Dell has a $30 carrier that allows you to use a hard drive in the media bay. For my inspiron 8200 the part number is 29MFN for a 9.5mm drive. For a drive, look at the IBM 40GNX with 8mb of cache. There are lots of discussions on this at dell's forums at delltalk.us.dell.com in the inspiron hard drive forum.