From Apple: If your blue and white Power Macintosh G3 or Macintosh Server G3 came with a single channel Ultra2 low voltage differential (LVD) SCSI card, run this updater to install firmware on the card that will yield more stable system performance. The new firmware is necessary to correct occasional problems related to cable termination that can occur when internal and external hard disk drives are connected to the card. Version 1.2 features improved stability, bug fixes, and added support for Mac OS 8.6. This software consists of a self-mounting Disk Copy compressed image (SMI) file. Download this software to your hard drive and then double-click it to use it. You do not need Disk Copy to access SMI files.
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