Re: Write Signal on Disk II Question

ferdimh@xxxxxx wrote:

Using a '74 one can reencode the signal read from disk and write it to
another disk at the same time. Then you only need to step over the
tracks while reading and you shold have a working copy (maybe you'll
need some circuitry to avoid writing during the seek).

A good idea, however it won't work if you start/end the writing in the
middle of a sector. The rotation speed is not constant enough to "hit"
the exact same bit the next time around. So you will need to start/end
the write in a gap. This means you have to detect gaps. Also, nibble
counts won't be exact without taking extra measures. So the idea of
doing this entirely "dumb" is probably not workable.

--
Linards Ticmanis
.

Relevant Pages

  • Re: Write Signal on Disk II Question
    ... So you will need to start/end ... the write in a gap. ... counts won't be exact without taking extra measures. ... "Beneath Apple DOS" says that one bit is 4us long, ...
    (comp.sys.apple2)
  • Re: Write Signal on Disk II Question
    ... another disk at the same time. ... however it won't work if you start/end the writing in the ... the write in a gap. ... counts won't be exact without taking extra measures. ...
    (comp.sys.apple2)
  • Re: Write Signal on Disk II Question
    ... The rotation speed is not constant enough to "hit" ... the write in a gap. ... counts won't be exact without taking extra measures. ... "Beneath Apple DOS" says that one bit is 4us long, ...
    (comp.sys.apple2)
  • Re: FS: Irwin 3/4 Forstner Bit for TZ 3rd Magnet 10.00 Shipped
    ... Although the 3/4 forstner bit works alright, a 20mm one is the EXACT ... The 3/4 bit will leave a small gap between the hole and the ...
    (rec.games.pinball)