awesome fist productions wrote:
...camera can fit Digital data on the manitic particles and playback head and when its on the tape and not hooked to anything its non Digital until you have a device that can turn it into Digital data.
That's kinda true, what I think you're saying - you're saying (stop me if I'm wrong) that all magnetic media are inherently analogue as the polarization of the magnetic particles is done through a process of switching current off and on in a circuit? IE it is a variable flow of electrons, hence analogue. If that's what you're saying, yes you are right, but it's a bit more complicated than that -
Digital data is as you know just 1's and 0's - that's ALL it is, whether computer programme or video file. However in order to use those 1's and 0's (binary bits) we need to store them somewhere, so we use either magnetic tape, hard drive, memory card, punched cards, optical discs, floppy discs, and many other formats. Let's forget floppy discs, they're history. Likewise punched cards for now, despite them being very 'binary' - it's just too too much data for either.
Now it may feel like a hard drive is somehow less analogue than a tape - you put binary digital data into it, you read it off of it, but inside the hard drive are...magnetic discs and a tiny (well several tiny) heads - it's the exact same technology inside, just in a different shape. If you doubt that, run your hard drive through a strong magnet, you'll lose your data. In fact tapes are more rugged in terms of track width, moving parts, etc., and easier to fix too!
Whilst we're here, a quick peep at the other formats - optical discs (DVD/BluRay etc) store data as dents or pits on a layer of foil - yep you go via the very analogue medium of light waves to read (and write) them. Memory cards are electronic gates which retain certain positions by maintaining charges- a few electrons here and there - and back in the analogue world.
You see digital data is an abstract concept, it does not exist in nature, it is entirely man-made. Every time we want our clever concept to interact with the real (analogue) world, we have to find a way to represent it in simplified analogue terms (magnetic particle polarity, electrons in potential wells, dimples on a bit of foil, etc). Digital radio is a digital signal on top of an analogue carrier. Optical fibres use light (which is analogue) to carry a digital signal on top of an analogue one. Indeed, inside your computer, inside the CPU, you've got a heap of transistors (and I mean lots and very lots, but you could make a theoretical CPU with loads of transistors and a soldering iron - and OCD). Transistors are...analogue devices! They're not switches, they're little amplifiers used at the two extremes of their range. Again, our human concept of "binary" is, in the real world, implemented in analogue!!
So yes, you're right to a point, but tape is no more analogue inherently than any other system we have - hard drives included. Punched cards (holes in cardboard) are probably the most literal, and in some senses most binary, of the storage media. ..consider that!