Bad drive in RAID array

My in-laws have an older Dell desktop PC running XP and recently are getting a message telling them that one of the drivers in the raid array is bad. It looks like there are 2 drives '0' and '1' and the #1 is the bad drive. They are both the stock 250GB WD hard drives that came with the machine. Do I need to replace it with the exact same drive or will any SATA 250GB work? Let me know if more info is needed. Thanks
 
Check the specs of the failed hd (ie make/model) online to verify *IF* yours is hot pluggable - - you should match the specs
of the failed device.
 
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