Strange anomaly here.

I have two HDDs, drive 1 on Primary Master & drive 2 on Primary Slave.

My OS is WXP PRO SP2.

I use the drive 2 slave for backups.

I made a clone backup of the drive 1 Master onto the drive 2 Slave.

Seemed to work fine - the backup program recognized the presence of
both drives and did the clone backup.

Afterwards, the BIOS recognized both drives, and I can boot from
either by altering the Boot Drive in BIOS. However, if I re-boot from
drive 2 Slave, My Computer (and Windows Explorer) will not recognize
the existence of drive 1 Master at all. This despite the fact that
Device Manager recognizes both drives and says both are working
'properly'. Whereas, if I re-boot in the original setup from drive 1
Master, My Computer (and Windows Explorer) will recognize the
existence of drive 2 Slave just fine. What am I missing here?

Thanks

Jethro

neither boot drive will recognize the other drive.