EZ5xx-Series Solid-State Disk Drive

This user guide provides comprehensive information for configuring and installing Digital Equipment Corporation's EZ5xx-Series Solid-State Disk Drives, encompassing models EZ51R, EZ54R, and EZ58R. These 5.25-inch drives feature varying formatted capacities from 106.9 MB to 855.3 MB and utilize a single-ended SCSI-2 interface with integrated data retention.

A core feature is the continuous data retention system, which actively saves modified data to an internal disk. In the event of a power failure, the drives seamlessly switch to integral NiCAD battery power, write-protect themselves, save all memory array contents to the internal retention disk, and then power down to conserve battery life. Upon power restoration, the drive performs a self-test and restores data to the memory arrays, prioritizing host requests. New or replaced batteries require at least four hours of charging to ensure sufficient power for full data save operations, and instructions for proper battery disposal are included.

The document details essential setup and maintenance procedures, including setting SCSI bus addresses (0-7) via jumpers, interpreting Busy and Fault LED indicators, and configuring SCSI bus termination. It also specifies power connection requirements and provides extensive functional, environmental, capacity, and geometry specifications. While the drives require minimal preventive maintenance, detailed instructions for battery pack removal and replacement are provided. Crucially, the guide emphasizes that users remain responsible for implementing regular data backup procedures, treating the EZ5xx drives as any other master storage media despite their data retention capabilities.