![]() As shown in the first photo on this page, machines designed for auto-inject mechanisms have the narrow floppy slot that is just wide enough for the floppy disk itself. There is a characteristic “kerchunk” sound as the disk and holder drop vertically onto the drive motor. The term “auto-inject” derives from the property of the mechanism’s design whereby when a floppy disk is inserted most of the way (say, 3/4 of the way or more), the mechanism grabs and pulls the disk the rest of the way in. The original SuperDrive was made by Sony, the maker of all Apple 3.5" floppy drives up until the mid-1990s. At present, this page only discusses desktop Mac floppy drives, not PowerBook variants. ![]() This page will attempt to clarify which differences are important and which are insignificant to users. (400k floppies formatted with MFS are far, far more common amongst Mac 400k floppies than those extremely rare few custom-formatted with HFS.) Over the years from the late 1980s up until the birth of the iMac in the late 1990s, there have been several OEM vendors for the floppy drive and two major variations for desktop Macs: auto-inject and manual-inject. They will also read, write, and format 400k MFS disks, with appropriate Mac OS or utility support. ![]() The original “SuperDrive” name came from the drive’s then-rare ability to correctly format, write, and read all of 400k, 800k, and 1.4 MB Mac HFS-formatted floppy disks. ![]() In recent (August 2004) online discussions, it is apparent that there is some confusion in some circles regarding the interchangeability of different versions of what Apple calls the “SuperDrive”: the standard 3.5" floppy drive built into most beige Macintosh models since just after the original Mac II.
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