Mirror madness?

I had an incident recently involving failure of a drive in a RAID 1 array. The failed drive was replaced, the rebuild started but failed at 99%. I narrowed this down to a number of corrupt files on the shadow copy , removed the offending files, replaced and rebuilt the offending drives. On looking at the RAID controller documentation (Storageworks RAID 230) it appears that drives are not failed on soft errors.Surely it’s better to mirror the 99.99% of good files than refusing to rebuild the mirror due to a handful of(in this case expendable)corrupt files?