Written Data Cannot Be Read

This FCO document, ORV20-0001, provides instructions for addressing various performance and reliability issues with the RV20 optical drive subsystem, such as data read errors, fatal controller faults, motor speed faults, and power supply crowbars. The solution involves performing circuit and code changes to the SDC, ISI, BPT, and LESI Printed Circuit Assemblies (PCAs). The procedure includes verifying the drive integrity before beginning the upgrade, accessing the internal components, performing the FRU swaps as specified, updating the firmware revision level to C3, and conducting both off-line and on-line testing to ensure the drive is operational. The document emphasizes the use of static precautions and proper diagnostic cartridges for testing.