720kb Floppy drives

September 22, 2011 at 06:53:56
Specs: dos
my old os only allows 720kb floppy drives how do I convert a 1.44Mb drive to 720kb (I have heard people mention changing resistors etc.)

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#1
September 22, 2011 at 12:45:59
You should not need to.

Just install it, and with luck it should work without problem.

Good Luck - Keep us posted.


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#2
September 22, 2011 at 15:29:48
You didn't mention your specs (OS, Hardware, etc.).

"Channeling the spirit of jboy..."


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#3
September 22, 2011 at 22:29:04
You don't.

You just put a 720K disk in it and the holes in the floppy disk case will operate a switch that changes the drive to 720K for you. IF you have a 1.4 meg drive that does 720K too - some don't do this trick, but most do right out of the box. Download the specifications pdf for the drive model number to learn more.

The resistor talk you speak of is drive specific to force a drive to be one or the other density and should only be followed for the exact model number of drive that the text is about.

Lee


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#4
September 23, 2011 at 07:43:02
You just put a 720K disk in it and the holes in the floppy disk case will operate a switch that changes the drive to 720K for you.

No totally true....you have to reformat it to 720 after taping the hole.

Some HELP in posting on Computing.net plus free progs and instructions 7 Medals


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#5
September 23, 2011 at 14:52:40
Hi Xpuser

a pc that only supports DD - 720k floppies does not recognise the 'extra' square hole and formats any disk to 720k.

I have experienced problems where such HD floppies (formatted to DD) cannot then be read on later machines, unless the 'extra' hole is blanked off with black tape.

Reason for black tape, is some sensors are light operated.

Good Luck - Keep us posted.


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#6
September 23, 2011 at 19:18:22
If the OP has an 8088 machine he can't use a 1.44 drive unless he's got an adapter card. You can't call a 1.44 drive a 720 drive and have it work. If he has a 286 or higher then the bios will accept a 1.44 drive and as already mentioned, it can format and use 720 disks

I haven't used dos below 3.3 so I'm not sure what happens if you use an older dos on systems with a working 1.44.

I'd like to hear back from the OP on what kind of hardware he has. If it is at least a 286 then he should upgrade his dos instead of trying to find a 720 drive.


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#7
October 30, 2011 at 11:19:32
he could tape the side and try to format it. It worked for me

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