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. You can also choose to create an MS-DOS startup disk, which is useful if you're troubleshooting an older machine, but you won't be able to use the disk for storage.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. The speed gains for quick formatting a floppy disk are negligible, so you're probably best leaving this unchecked. You can select "Quick Format" to format the disk quicker, but the data will not be securely deleted. Volume label - Choose a name for the disk that will appear when it is inserted.Allocation unit size - This should be set to Default allocation size.FAT is supported on Windows, Mac, and Linux. Most users can leave this as is, unless you are formatting the disk for use with a specific file system. File system - This should be set to FAT.Capacity - This should be set to 3.5", 1.44 MB.You can use this window to choose your format settings before beginning. Select "Format" and choose your settings.
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