I have a dell poweredge 1600sc server running windows 2000 server. there are 2 seagate hard disks mirrored in RAID 1. A technician in the office restarted the server to eject the tape from its drive and discovered this beeping sound upon restarting. I suspect he powered off the server to quickly restart - no proof of that. The beeping sound led us to find the array had failed. The disk in bay 0 on controller 0 is now reading "failed". The disk in bay 1 is online.

I did a rebuild straight away but the rebuild completes and the disk still reads "failed". I powered down the server and inserted a new disk into it but the rebuild takes place and the disk still reads "failed". I read the previous failed disk on another machine and can see all contents and I feel this disk is not at all faulty.

What could be the problem now as I need to get the virtual disk out of the degraded state. The system is as PERC Subsystem 1 - CERC ATA100/4ch Controller 0

Any similar problems faced by anybody please help as I fear the second good disk that is currently working might go down again.
Thanks.