Can’t view Win2k Slave drive on XP PC

I am trying to recover files for a non-PC savy friend whose HDD says OS is missing at boot (older 60 gig Quantum Fireball Plus AS from HP AMD 1100 machine).
I have used a USB device for HDD that rarely fails. I have made the drive slave on both the primary and secondary IDE channels. It shows in BIOS, shows during post, shows in device manager, but no drive letter in explorer and does not show in disk management. Could this 2k drive have some type of file protection? I have tried everything. Strange it shows so many places but cannot access.

Thanks, MAG600