A term used interchangeably with dikette is

A diskette (often misspelled as dikette) is the formal term for a floppy disk - a thin, flexible magnetic storage disk enclosed in a protective plastic casing. Floppy disks were commonly used in personal computers from the 1970s through the 1990s for data storage and transfer. The other options are different storage technologies: disk cartridges are enclosed disk units, disk packs are multiple disks on a spindle, and packette disk is not a standard term.