https://jeltsch.org/en/tags/usb-support/Recent content in USB Support on Michael’s DomainHugoen-usCopyright © 2002 - 2026 Michael Jeltsch.Fri, 24 Jul 2026 00:18:18 +0300https://jeltsch.org/en/old_macs_and_usb_support/Tue, 17 Mar 2009 00:00:00 +0000https://jeltsch.org/en/old_macs_and_usb_support/<p>We have a few legacy Macintosh computers at work which are still running different flavours of <a href="http://en.wikipedia.org/wiki/Mac_OS_9" target="_blank" rel="noopener noreferrer nofollow">MacOS 9&nbsp; <svg class="svg-inline--fa fas fa-up-right-from-square fa-2xs" fill="currentColor" aria-hidden="true" role="img" viewBox="0 0 512 512" overflow="visible"><use href="#fas-up-right-from-square"></use></svg></a> . Although these machines have USB ports, they are mostly non-functional. I think MacOS 9.0 was the first version that supported USB mass storage devices, but apparently support has been shaky until and including version 9.2.2. Apparently the various updates to MacOS 9 mainly addressed the problems with USB (and firewire) support. At least for one of these machines (running MAcOS 9.2.2) I managed to fix the USB support. I removed all non-Apple USB- and firewire-related extensions from the system folder (e.g. some from Lacie). Then I downloaded the <a href="http://docs.info.apple.com/article.html?artnum=75103" target="_blank" rel="noopener noreferrer nofollow">MacOS 9.1 upgrade&nbsp; <svg class="svg-inline--fa fas fa-up-right-from-square fa-2xs" fill="currentColor" aria-hidden="true" role="img" viewBox="0 0 512 512" overflow="visible"><use href="#fas-up-right-from-square"></use></svg></a> from Apple and extracted all USB-related extensions using <a href="http://www.versiontracker.com/dyn/moreinfo/macos/4561" target="_blank" rel="noopener noreferrer nofollow">TomeViewer&nbsp; <svg class="svg-inline--fa fas fa-up-right-from-square fa-2xs" fill="currentColor" aria-hidden="true" role="img" viewBox="0 0 512 512" overflow="visible"><use href="#fas-up-right-from-square"></use></svg></a> and replaced the existing (9.2.2) extensions by these (9.1) counterparts. After a reboot my (PC-formatted) USB stick was recognized immediately. Here is the list of extensions that I replaced:</p>