Others - Bugs writing to floppy disks. Causes and methods of struggle.

<b>Others</b> - Bugs writing to floppy disks. Causes and methods of struggle.

       Glitches record

              Glitches record
(C) KSA-7G


   Write once something on the disk and get the message "READ 
ONLY" ... Take out the disc, remembering when I could seal it, 
I see that it is not protected, insert back and successfully 
saved. Something there even copied, head pop up strange ideas - 
the classics: miracles do not happen, nothing lasts forever 
under the moon, and not go if I eat ... oops! (This is, like, I 
do not think) for all costs reason, by itself nothing happens;

not explicitly eliminated, be apparent glitch!

   In general, get a second "READ ONLY", take out the disc - 
Yeah, he has suspiciously little protective slot ... compare - 
NO - Everything is OK. 0:1, the slot as the slot. Work

on, history repeats itself ... Gloomy thoughts: open, short, 
sdyhaet flopokrut recently cleaned the head ... head! And when 
In general, I was cleaning the optics? I decide to complete 
first job, do it successfully. 

   I opened the comp. Take a marker obvozhu LED (this is 
certainly not necessary, but not I want to break the 
proprietary assembly SAMSUNG). Turn off the LED (its reliance 
on a single screws), pull out a match, cotton candy, liquid (for

head cleaning). Carefully wipe the LED and through the opening, 
a photodiode. On fleece / match left some brownish fibers. Fix 
the LED close PC, check the efficiency of disk protection - 
everything works fine, since there are no problems (a week). 

   I'm on the computer is a strip of dense
paper, and if I'm not sure about the correct behavior SOFTa, or 
going to test their program codes, it is preserved, insert this 
strip into the drive, closing the sensor protection zapisi.Malo 
whether to zaneset CPU Mr. RANDOMZETS YUZYARYCH. True, the 
reason never was, but better be careful,

What then RESTORit drive. Probably, the fibers
paper, and dust off the old drive in the clogged channel 
photocell and cause message "READ ONLY". By the way, I could 
mix of light and a photodiode, but it has no values.


   Hopefully this article to someone, something to recall. 
Let's consider the possibility of data corruption. I drive a 
sensor data protection, and electronic switch signals. 
Information from the probe enters the complex, while the 
electronic switch. If the disc is protected by a plastic - a 
record for He (sort of like) is blocked by hardware regardless 
of the signal from a computer (though I do not rule out the 
possibility of a gradual deterioration sealed drive on some 
older flop As written in SPECTROFON'e seemingly). But

imagine this situation: the sensor is clogged
and on the verge of protection diska.Pri it logically
record still permitted. Recording starts,
disk is spinning, spreading to all corners of his
envelope, perhaps, centuries-old dust, and at some time 
triggered sensor protection disc. There are different options, 
but in any  case record will be broken HARDWARE:


  1. Pulse duration of protection locks controller 
diskovoda.Dalee program will prompted to overwrite. Certainly 
be able to save. If user would guess he will clean your

 drive, and everything will be OK

  2. Short-term momentum (and even more so,
If, after the sensor is no Schmitt trigger) does not
will be recorded. Drive controller is not
have time to interrogate the sensor (possible at all
This? No documentation on the chip to tell it
not exactly), t.e.danny failure itself does not show, but the 
data on the disk will probably isporchennymi.A then we wonder - 
where a good drive bad record? Pho rmatnem - and it's perfectly 
good ... 

  3. Impulse write protect happen
the end of the record and therefore will not be recorded, and 
data on the disk spoil. 


   Although unlikely event 3,
it can not be excluded. Basically it all depends on the drive. 
If, after the sensor is Schmitt Trigger, the probability of 
events and 2, and 3 negligible, because by inertia

Physics particles (dust) performance
Comptroller enough to fix the fault. However, the event is 
still under 3 voprosom.Imenno therefore ideal sensor (forming 
long enough to be noticed momentum, and while it would be 
noticed) does not exist! 


   Bottom line: the best defense against incomprehensible
corruption drives - contain and technology, and media in good 
usloviyah.Uchityvaya that I have is the first such failure 
(illogical message "READ ONLY") over the years, enough to clean 
the sensor protection record once a year. But such a long 
period of time itself itself leads to doubt, moreover, can not 
be say exactly when it becomes clogged, it depends on various 
factors. Therefore, probably should clean it every 1-2 months, 
you can a time when cleaning the heads, can be on major 
holidays (cleaning the house, and in a computer at the same 
time sweep the cockroaches) - for example, Easter, Independence 
Day and New Year. But in either case, the illogical

message "READ ONLY" should cause your
CLEAR-INTERRUPT, and NMI!


   As you know, in the drive, there are three
photosensor (in the old two): the index hole, the detector 
having disk position zero track. They also should not forget, 
and cleanse at least once a year. Although I he is not doing 
nih.rena ... fool ... Most importantly, to the index hole 
sensor and the zero track triggered by formatting, in other 
cases, the information will be taken from the disc, and head 
for error repositioned. Although ... If the directory

read from the first track ... Themselves understood!
In short, do not forget the interior of his
komputera, they too need to pohmelyatsya ...



   And now all together took! And flooded
drives cleaned! And no me there:

   Can not, CAN NOT, I DO NOT KNOW HOW

   And so on ...

March 19, 2003 KSA-7G