Quantum Maverick Prodrive and Quantum Fireball ST

[neuron]

Hi,
I have several ancients disks to test and try (>20)
2 Quantum Maverick Prodrive 540MB - One is ok and the other no dectect, so I change the PCB from one to another and the "no detect " the same behavior.

Another set of disks:
3 Quantum Fireball ST 2.1AT P/N ST21A013 Rev 02-C

One is ok the other 2 "no detect" change the PCB and the same thing.

Thanks for the answers,
Ruy Benton

[BlackST]

PCB swap is no solution if the drive(s) have firmware issue, and relevant part of the FW is on the platters not on the PCB.