(I skipped Mojave.) If you don’t have an old Mac for the process below, see if you can find somebody with Monterey on their Mac who should/might be able to read the discs for you. I am guessing that Apple included the HFS drivers in Monterey or some other magic that wasn’t there in Catalina or Big Sur. ![]() However, I was quite surprised when I found I could directly open the medical DVDs without problem after I upgraded my 2019 MBA to Monterey (macOS 12). To work around this I would open the DVD on my High Sierra MBP and create a new disk image (see below) that I could then open in Catalina on my 2019 MBA. When I was running Catalina (10.15) or Big Sur (11) on my 2019 MacBook Air I could read the CDs fine but the DVDs would give me the same error you’re getting (Disk Utility sees the disk but can’t mount it). Disk Utility says the CDs are in ‘Universal Disk Format (UD)’ and the DVDs are in ‘MacOS Standard’ (probably HFS) format. On my 2011 MacBook Pro running High Sierra (10.13) I could read both the medical CDs and DVDs. I’ve been battling this issue with DVDs I get from medical facilities. My MacBook Pro/Catalina doesn’t recognize the discs when I try to mount them nor is disc utility able to mount them even though it “sees” them. In the Finder, I can see the MacBinary representations of the files: $ sudo hcopy -m Devices Devices.idx ~/tmp $ sudo hcd ":Technical Documentation:Inside Macintosh:" I will copy the files using “MacBinary” format, which is the recommended way to preserve the resource forks. These are for Apple’s DocViewer application, which only runs on Classic MacOS and has almost certainly never been ported to Mac OS X, but I’ll see what I can extract. I’m going to copy over the Inside Macintosh: Devices book. :Technical Documentation:Inside Macintosh:į TEXT/ttxt 332 596 Where is QuickDraw GX?ĭ 15 items Advanced Color Imaging (Draft)į ONLN/HLX2 275106 13193587 AOCE Application Interfacesį btre/HLX848 AOCE Application Interfaces.idxį ONLN/HLX2 84718 6067404 AOCE Service Access Modulesį btre/HLX888 AOCE Service Access Modules.idx The -R option can be used to recursively descend through the directory tree: $ sudo hls -lR | less The hls command shows directories: $ sudo hcdį APPL/dsi1 789111 488608 Contents Catalog Volume was last modified on Wed Jan 25 18:03:03 1995 Volume was created on Mon Jan 16 10:43:13 1995 Step 4: Mount the volume in hfsutils $ sudo hmount /dev/disk3s1s2 You can see the same thing with the graphical Disk Utility: So the partition I want to mount is /dev/disk3s1s2. I inserted the CD and used the command-line diskutil tool to get the device information: $ diskutil listġ: Apple_partition_scheme 681.9 MB disk3s1ģ: Apple_HFS Dev.CD Mar 95 681.5 MB disk3s1s2 ![]() The source may be a block device orĪ regular file containing an HFS volume image. Hmount is used to introduce a new HFS volume. Hmount - introduce a new HFS volume and make it current > Scanning binaries for linking errorsĪnd confirm that there is an installation: $ man hmount > Installing hfsutils Activating hfsutils Cleaning hfsutils I used MacPorts: $ sudo port install hfsutils Once that is done, you can burn a new CD in ISO-8859 or HFS+ format, which modern versions of macOS can support.įollowing this lead, I tried to copy files off of an old Apple developer CD (the March 1995 reference library, FWIW). Then use it to copy all the files to local storage. My recommendation, if you need anything more than trivial access, is to set up an emulator or VM running any version of macOS from 6 through 10.14. See also hard drive - Reading HFS standard and MFS on Catalina - Ask Different Some Linux distributions include an HFS file system that can mount an HFS volume directly.Hfsutils has been ported to macOS via MacPorts and Homebrew. It is a set of command-line tools and is pretty awkward to use, but you can use it to copy files from an HFS volume to something else. In the Linux world, there is the hfsutils package that can access HFS-formatted media. ![]() You may need to give the VM/emulator direct access to the optical drive or create a disc image for it to use. You should also be able to run macOS 10.14 (or older) in a virtual machine or an emulator.If you have an old Mac that can read them (this would be anything running macOS 10.14 (“Mojave”) or older), use that Mac to read the files.They were probably formatted using the old HFS (“Mac OS Standard”) file system, which Apple dropped in macOS 10.15 (“Catalina”).
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