Write-Protect Tab (you call it a "notch") is a little plastic rectangle in the upper right corner of most floppy disks. When the hole is open, the disk is locked and you can't add any more files to...
These items are probably before your time. Back in the day before even cassette tapes were invented, tape-recordings were "reel to reel" like cinema film. These reel-to-reel tapes were used to record...