Mac OS 8.5.1 Update is out; New Drive Setup addresses "data loss and corruption" issue

Mac OS 8.5.1 is out. A TIL file has the Read Me information. Here is an excerpt:

What's new in Mac OS 8.5.1 Update

In response to initial customer and developer feedback, Apple has investigated reports concerning data loss and corruption and in response has made improvements to Drive Setup and provided updates to correct other customer issues. Mac OS 8.5.1 Update fixes a memory leak in AppleScript, a memory problem in the file system (asynchronous File I/O error, as reported by FileMaker Pro users), and a Mac OS Extended format corruption issue, re-enables the use of many third party ADB devices, and provides some improved communication through Internet proxy firewalls for Sherlock. In addition, Apple has developed a number of additional Sherlock plug-ins that are included in this update. Watch for new plug-ins on the Sherlock Plug-in Directory.

Drive Setup 1.6.2

Previous versions of Drive Setup can overwrite small portions of the Mac OS Standard format partition if the partitions on the target drive are not as expected. This is an extremely rare occurrence, but could cause drive repair utilities to report that block 0 of that volume is bad or cause the drive not to show up on the desktop.

Volumes initialized or updated with previous versions of Drive Setup also may not always have the needed patches installed on the hard drive. These patches are now installed on all drives.