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Hall Effect, Dry Reed Switches and FDDs

By ForbTech ·
I am currently doing write-ups for a course I'm doing, and Hall Effect and dry reed switches came up, in relation to floppy drives.

What do these have in common with each other?

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Hall Effect, Dry Reed Switches and FDDs

by Bill Cassada In reply to Hall Effect, Dry Reed Swi ...

The "Hall Effect" is named after Edwin Hall who discovered the effect in 1879. The basic "Hall Effect" sensing element is a semiconductor device which, when biased by an electrical current through it, will generate an electrical voltage proportionalto the magnitude of a magnetic field flowing perpendicular to the surface of the semiconductor.

Reed Switch: A magnetically-activated, hermetically sealed sensor.

It doesn't take a genius to know that the first two make the third, the floppy drive, possible.

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Hall Effect, Dry Reed Switches and FDDs

by ForbTech In reply to Hall Effect, Dry Reed Swi ...

Please don't think of me as being ungrateful, it's just that this wretched thing will not allow me to post a comment without putting a rating, and I need a little more info from you before I close it as solved!

On the understanding that Ihave a BASIC comprehension of electronics, would I be right in interpreting your definition of Hall's as being the method in which data is written to and erase from disks??

If this is the case, where then do dry reed switches figure in a floppydrive's operation?!?!?

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Hall Effect, Dry Reed Switches and FDDs

by rgravelle In reply to Hall Effect, Dry Reed Swi ...

The reed switch is made up of a small cylindrical glass envelope inside which there
are two iron metal contacts.On the outside
of the glass tube, there is a copper coil
which when energised will cause the contacts
to close or open depending if it is normaly
open or normaly closed.

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Hall Effect, Dry Reed Switches and FDDs

by ForbTech In reply to Hall Effect, Dry Reed Swi ...

I was already aware of what a reed switch looks like, and how it works, but I need to know how and why it is utilise in floppy drives.

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Hall Effect, Dry Reed Switches and FDDs

by ForbTech In reply to Hall Effect, Dry Reed Swi ...

It would appear that my tutor has been erroneous in his instructions: for "dry reed switch", please read "dry read switch". He informs me that this "switch allows you to perform test reads and/or writes on an FDD without the obligatory floppy disk (to avoid the disk getting damaged if the drive is faulty). Is this true or false?!?!?

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Hall Effect, Dry Reed Switches and FDDs

by Bill Cassada In reply to Hall Effect, Dry Reed Swi ...

The Hall effect is what is utilized to discover the position of the read/write head. This, in turn, allows one to write data to the disk, but is not what determines that state of the charge on the media.

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Hall Effect, Dry Reed Switches and FDDs

by ForbTech In reply to Hall Effect, Dry Reed Swi ...

Thank you SO much 4 taking the time out 2 answer this question. I apologise for not having answered you sooner, but I have long since finished the course and have kinda been out of circulation for a spell. Thanx once again!

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Hall Effect, Dry Reed Switches and FDDs

by ForbTech In reply to Hall Effect, Dry Reed Swi ...

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