open the tag at the corner of a floppy disc in order to protect the contents from being edited or accidentally deleted
A tab on a floppy disc or a function in a unit which protects recorded or stored data from being damaged or erased by writing over it.
In computing, protect the data on a disk or file from being accidentally deleted or edited
To protect data (either on a disk or in memory) from being written to, although data can still be read.