How to Identify... Sound and Cassettes

Sound format examples

compact cassette100mm x 84mm x 12mm

8 track cartridge135mm x 100mm x 21mm

reel tape3 inch to 10 1/2 inch diameter reels

vinyl record

7 inch dia 45 rpm (usually 1 song per side)
7 inch dia 45 rpm Extended Play (usually 2 songs per side)
10 and 12 inch dia 33 1/3 rpm Long Play
10 and 12 inch dia 78 rpm (mostly made with heavier non flexible material)
Note that some pre 1960s records may be one off direct cut, these are much heavier having a central metal core.