Field Change Order: Upgrade to Fix Data Corruption Problem

This Field Change Order (FCO) addresses a data corruption issue in RF31T, RF35, and RF73 disk drives on VAX VMS and OpenVMS systems. The problem occurs when applications utilize the IO$_WRITECHECK function, which can lead to incorrect data being returned in certain scenarios. The solution requires upgrading the disk drive firmware to at least revision T387 (or current shipping version T392). The document provides:

• Applicability Details: Lists affected drive types and operating systems.
• Technical Overview: Explains the specific scenarios causing corruption (e.g., Volume Shadowing, failed Compare commands).
• Upgrade Procedure: Details the installation of firmware using a TK50 tape-based loader, including precautions such as performing a system backup.
• Configuration Guidance: Includes instructions for checking firmware revisions using VMS commands and managing disk parameters like HISPEED.
• Important Restrictions: Outlines necessary system privileges, working set quotas, and specific hardware requirements (e.g., flash write enable jumpers on RF73 models).
• Troubleshooting: Lists status codes and error messages for the firmware loader program.