I have had two floppy drive with the bad, the symptoms can not read and write, there is no floppy disk is always prompt, and occasionally be able to read and write often halfway error, blue screen phenomenon. Watching two old floppy gesture, thought of "Computer News" has been introduced on the head can lead to not offset the normal read and write, so they decided to explore what happens yourself.
First, remove the floppy drive before the plastic panel, and then open the top of the closures, take a floppy disk inserted and removed several times, to look at whether the activities of mechanical parts such as heads and flexible, whether slow or stuck phenomenon, not found after several tests anomaly, in the end is what causes the normal floppy drive can not read and write it?
Recall information on the introduced offset if the heads can read and write their own formatted floppy disk, so they open the case, the power lines and data lines are already open the cover back into the floppy drive, the boot and a blank, formatted floppy disk , saw a few heads back and forth repeatedly appeared error box "No floppy disk" format can not be, it seems the problem is not a simple head offset. Shut down and remove the floppy drive, carefully watched the head of the structure and found the head and disk contact is through the head on a spring pressure to achieve, is it too small to cause the contact pressure can not read and write floppy disks? Holding forceps gently lift the tape head, feeling very loose and weak, and careful observation of compression springs, one end of spring found three steps, apparently used to adjust the spring pressure, but now spring is in the best next step, so use forceps the spring to move a step above most. Boot test, reading, writing, formatting, all floppy disk as usual, the problem is resolved.
Contact pressure due to head and the disk is too small can not read and write the question properly confirmed. Then quickly open another floppy drive, follow the same method of debugging, really effective immediately. After a long trial, the first floppy drive is very stable and reliable, the second floppy accidental previous symptoms. Re-open a second floppy drive, won the compression spring, spring has been found that the plastic deformation, elastic enough (Note: The floppy drive is a hybrid brand), resulting in less stable. I found a little improvement of the same size of the spring, according to a production stood back, after a trial effect was very good. If you do not have the same spring, the spring can also be the original direction in the opposite direction to the elastic force twisting, and to bring a certain amount of plastic deformation, increase its elasticity, the effect is also very good.
This shows that the floppy drive can not read and write properly or do not recognize when a floppy disk, may not have big problems, not easily discarded, but not necessarily head offset, and do not easily adjust the head position to avoid a mess the more adjusted to floppy repair more difficult. I think people often play on the computer side there are several such floppy sure, might do the same method a try.
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