(C) Cobra
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All sinkleristam that
pumped files from computers
IBM clone known so-called problem of 800K floppy disks - to ZX
when read always occurs unfortunate error: disk
error tr xx sec 10, and as offensive
happens when, after so many torments refuses to read the
information extracted, and all because of the fact that the
disk has been formatted not at 720 k and at 800K, and,
interestno that:
1.If the drive was formatted
Rowan on the Spectrum, the nick
FIR problems with reading are not
there!
2.When reading IBM compatible
mymi computers sinkle
Cooper floppy disks, which
pre-formatted
Wali in TR-DOS, also arises
Cabins errors of a different character
character - not read first
vy sector on the track!? But
If the drive is otrestavri
synchronize, for example, in the RDS, then
no problems no longer
there ...
Let us see why this
prishodit.Posle analysis program RDS has learned that our
ill-fated sector, one that is under
number 10, has the label + +? And
This means the following - a title
sector is, the sector itself is, but
here's the problem - it does not end
Checksum sector no!
Hmmm, interestno ... Further,
read the track with our drive team read track, I found
most interestnoe - our favorite
sector does not end at all!
After reading it to half, the team
read track interrupts their work.
It is known that the team read
track starts reading with the advent
index pulse (when
hole in the floppy disk coincides with
hole in an envelope disc)
reads the entire track, and on arrival
next index clock stops reading. Consequently, the clock pulse
arrives at a time when the sector is read ... And obviously,
the controller generates an error at this point
read ... And here arises
trivial solution - seal the index hole at all! Just
take and seal to the controller does not know when it comes to
index sync!
R A B O T A T E! ! !
CDs are read excellently!
And the whole business it was - sinklerovsky controller is
synchronized to the top of the index, and IBM-ovsky - at the
end! Hence the all the trouble. There is a slight bias in the
results of which Sinclair did not read the last sector, and IBM
- the first (it is known that TR-DOS creates the first sector
is indented from the start tracks less than disc
utilities, such as RDS ...).
So we can safely say
that one problemma Sinclair
fewer - here I am, until stuffing the text, listening to MOD-uk
which is loaded with this here
Disk ...
In continuing its consideration of
questions about the mysteries of TR-DOS like
appeal to readers: if anyone
know some details of
Life TR-DOS, for example, why
read track team, in some cases do not stop reading
even the arrival of the index sync, please write in
HQ version of the address listed in the section titled Authors.
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