CompuServe Messages

I have a 48 Meg Seagate harddrive which I have been using for about two years. The drive is currently just under 1/2 way full. For some reason though, whenever I try to write a new file, the System comes back and tells me that I have a read/write error on the Harddisk. Is there a program available on the CompuServe or elsewhere which can analyze my Harddrive and tell me about the status of it. Also is there a way to tell the computer to 'skip' the next 'bad' area on the harddrive and store in the next available 'good' area?