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In this Instructable I will tell you how to covert a 1.44MB floppy disk to 720K format (MB = Megabytes, K = Kilobytes).

You might be wondering: "Why in the world would I want to convert a high capacity disk into a disk only capable of half it's original size?!?". Well, what if you have an old computer that only excepts 720K disks? Since 1.44MB disks are much more common than 720K, why not convert a few of your extras? This is something I figured out on my own, but I'm sure it's been done before.

Ok, now that we're done with the intro, let's make these!

Step 1: What You'll Need...

You will need:

At least one 1.44MB floppy you would like to convert, (make sure there is no data you want to keep!)

Tape

That's all!

Now we can make the disks!

Step 2: Make the Disks!

Ok, now we make them!

Find the square hole that does not have a slider. (Circled in the above pictures). Take a short length of tape, (3-4cm or 1 1/2inchs long), and cover both sides of the hole.

The reason this works, is that there is no physical difference between 1.44MB floppy disks and 720K disks, except that the 720K disk is missing the hole that you just covered.

Step 3: Format the Disks!

Now we need to format the disk.

You will need a computer with a floppy drive.

1: Insert your newly converted floppy into the drive.

For Windows Users: Go to my computer, right-click on the A: drive, click Format.

For Dos users, at the command prompt, type "Format A:".

Note: If your computer has two floppy drives, make sure you replace all the "A:"s in this step with whatever drive you put the disk in.

Step 4: You're Done!

Ok, you're done!

Please comment if you have any questions, comments, or problems!

Dear I have tried on Pentium D System with 1.44MB Floppy drive but have problem in format with 720k.
<p>There could be a few things going wrong, but first of all, you'll need to make sure you've reformatted the disk to the 720K format. It's also <em>possible</em> that your Dell's floppy drive doesn't support 720K floppy disks, but that's highly unlikely. I would (First of all) make sure the tape is still level with the surface of the disk (not indented or pressed in), then format it. If all else fails, it could be your disk is bad, so try again with another floppy disk. </p>
<p>Thanks! This worked perfectly, managed to save files on an old Smith Corona word processor I got, and then my old Dell read the floppy fine, and that has internet. I can now upload fines created on a word processor! :D</p>
<p>You're Welcome! I'm glad it was actually of use to you! :D</p>
<p>If I recall correctly, bytes are abbreviated by a capital B, whereas the lowercase one is for bits. Also mega is a capital M, therefore your sizes should be MB and KB accordingly (capital K, because binary value kilo prefix is like that).</p><p>Not being an ass or anything and I wouldn't have commented about this at all, but since the instructable is computer related I just had to.</p>
<p>That's fine, no offense taken. I'll edit the instructable to fix that!</p>
one problem, no one uses floppy disks any more
<p>Not exactly, If you are trying to write files to use an old Apple 2C There are quite a few hobbyists that use older tech. Take the Amiga fanatics for example. </p>
<p>I agree, I'm sure there are many hobbyists that use old tech, including me.</p>
<p>I love old tech someone has to curate the museum pieces for the next generations. </p>
<p>I agree.</p>
<p>I do! </p>
<p>You can usually go the other way too, but don't depend on the reliability of the disk.<br>I learned to program on an apple IIe, 5-1/4&quot; floppies where my friend back then.</p>
<p>Do you mean convert a 720k to 1.44mb? Yeah, I was thinking about how you could do that, and realized that it might be backwards compatable.</p>
<p>I used to do it the quick and dirty way by just taking a hole punch and punching a hole in the disc where the 1.44 hole would be.</p>
<p>The hole punch trick also made double side 5.25 floppies. </p>
<p>I did that too! With 5-1/4&quot; floppies.... but to tell you the truth, those floppies were already old when I started to work seriously on computers ;D</p>
<p>Nice. Thanks for sharing.</p>
<p>Thanks for commenting!</p>
<p>Entered in the tech contest, vote if it was helpful!</p>

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Bio: I am a electronic maniac. I take things apart to see how they work or what I could use out of them, and I love ... More »
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