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Because their system ROMs did not support these drives, the 1986 Mac Plus and 512Ke do not work with Apple’s HD floppy drives.Īpple SuperDrive floppy drives use a variable speed motor, making them compatible with 400K and 800K floppy disks – as long as the operating system also supports them.Īny Mac with a built-in floppy drive introduced since September 1988 has an FDHD, and the March 1987 Mac SE and Mac II may have been updated for FDHD as well.
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Not only that, but the Mac SE was updated with the HD drive, and Apple offered upgrade kits for both the Mac II and pre-FHDH Mac SE. Going forward, all new Macs with floppy drives would have what Apple sometimes called FDHD (floppy disk, high density) or SuperDrive – not to be confused with the DVD-burning optical drive of the same name. 1.4 MB DisksĪpple introduced high density (HD) floppy disks to the Mac with the Mac IIx in September 1988.
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Macs running System 3 through Mac OS 9.2.2 support formatting 800K floppy disks. (Mac OS X does not support internal floppy drives.) Keep in mind, this was the age of 20-40 MB hard drives, 1 GB drives were a long ways off, and its only in recent years the 1 TB drives have become commonplace.Įxcept for the pre-1986 Macs that have built-in 400K floppy drives, all Macs running System 3 through Mac OS 9.2.2 and using an Apple or specifically Mac-compatible floppy drive can read 800K floppy disks. With HFS, the Mac gained a multi-level hierarchy of folders and the ability to access hard drive volumes at huge as 2 TB. Although the Mac makes it appear that it has true folders, this is an illusion.
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Those with pre-1986 Macs had to boot from a floppy drive that would install the HFS drivers that allowed them to boot from the HFS formatted hard drive.) MFS disks use a flat file system. (HFS had been introduced in 1985 to support Apple’s first Mac hard drive, the 20 MB Hard Disk 20, which connected via the slow floppy disk port. When Apple introduced the Mac Plus in January 1986, it adopted double-sided floppy drives with 800K capacity – and a newer disk format known as HFS, for Hierarchical File System. (There is also a 20 MB maximum volume size for MFS hard drives.)Īll Mac OS versions up to System 7.1 support formatting 400K floppy disks.
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Disk access is controlled by code in the system ROMs, and that can’t be updated to support double-sided drives.
There is also no support for floppy disks with greater than 400K capacity in those original three models. There is no support at all for 400K floppy disks in Mac OS 8 and beyond. Under Mac OS 7.6 and 7.6.1, they can read 400K floppies but not write to them. Macs with 800K double-sided drives and Mac-compatible 1.4MB High Density (HD) drives can read and write the MFS format used by 400K disks as long as they are running System 7.5.5 or earlier. (This is also the reason non-Mac computers can’t mount 400K and 800K Mac floppy disks.) These drives had a variable speed motor that allowed the Mac to pack 400K into a disk that would only hold 360 KB on a fixed-speed drive. The original Mac floppy disk format was MFS, for Macintosh File System, and it is only used for 400K single-sided floppies – the only kind of floppy drive supported by the original Macintosh, the Mac 512K Fat Mac, and the Lisa 2 (a.k.a.
Earlier today in the Apple Macintosh Enthusiasts Facebook group, Charles Lott asked if an OS X Mac with a USB floppy drive could write disks that a Mac running System 7 could use.
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