What kind of video tape do I have?

What kind of video tape do I have?

We have those decks which are marked with a dot .

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TV standards   size in inches     size in centimeter  
Analog PAL NTSC W D H W D H
 VHS (S-VHS) 7 1/2 4 1 18.8 10.2 2.5
 VHS-C (S-VHS-C) 3 5/8 2 2/7 4/5 9.2 5.8 2.0
 Video8 / Hi8 3 11/16 2 3/8 9/16 9.5 6.2 1.5
 U-matic  (3/4 inch tape)     8 11/16 5 1/2 1 1/4 22.1 14.0 3.2
 U-matic-S (small)     7 1/4 4 13/16 1 1/4 18.4 12.2 3.2
 Betacam/BetaSP (small)     6 1/7 3 7/9 1 15.6 9.6 2.5
 Betacam/BetaSP (large)     10 5 5/7 1 25.4 14.5 2.5
 BetaMAX     6 1/9 3 3/4 1 15.5 9.5 2.4
Digital PAL NTSC W D H W D H
 Digital 8 (digi 8) 3 11/16 2 3/8 9/16 9.5 6.2 1.5
 MiniDV (DVC) 2 3/5 1 8/9 1/2 6.6 4.8 1.2
 DVCAM 5 3  3/5 12.5 7.8 1.5