file compare fails...

I have a HP server with four 500GB hard drives. I completely re-did the

arrays we would have two arrays:

1. two hard drives are raid 1+0: 100GB is partitioned as C drive and the

other 400+GB is partitioned as E drive

2. two hard drives are raid 0 and partitioned as F drive

When file comparing two files on the F drives, it works, regardless of the

file size. When I do it on C or E, the file compare works for file size

under 1GB, but fails if it's over 1GB.

We had this problem with the previous install of the OS. We've replaced

several hardware stuff like CPU, memory, controller. We even did hard drive

diagnostics and didn't find any issues.

what could be causing the file compare to fail on one array and not the other?