Some here may take it for blasphemy, but as a lot of us do own a Windows rig, one might consider using the free IMGBurn with Windows to read or write HFS Mac CDs - even more when the Mac optical can not write by design or has developed issues over time.
Downloads page for latest version of ImgBurn
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If you plan to burn a .toast file from the Garden, just rename .toast to .iso and let IMGBurn do its job with the least possible speed.
I´m usually setting speed to 1X and let the app and the optical writer figure out...
As a bonus you will hear the nice jingle when IMGBurn completed its task. 
I did not create a single coaster so far going that way, but I did get piles of them from various Macs.
Using IMGBurn is brain dead simple, but If you should install IMGBurn, be sure to select custom install and uncheck all boxes offering adware and other crap.
If you want to archive a Mac HFS CD, start IMGBurn and insert your Mac CD afterwards.
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If IMGBurn does not suggest a suitable name for the new file, put in a nice name via the browse button.
(note the black/grey arrow in the pict above)
The button will pop up the Windows file requester where place and name of your new image may be specified:
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When ready, choose the least possible speed for archiving too, though this is not as vital compared to burning a file.
Archiving Mac CDs in mixed mode with e.g. audio partitions does work this way just the same.
IMGBurn will automatically select bin/cue if the CD´s volume structure is incompatible with ISO.
Handling DVDs is possible of course, but keep in mind the ≈3.7 GB limitation with FAT32 volumes.
Archiving a (double layer) Mac DVD will fail, unless the file is written to a NTFS volume.
