Commodore blog

A mysterious object that almost everyone recognizes, but few know why it's important—and even fewer actually use it: the vibration-damping cardboard insert designed for floppy drives, meant to protect the read/write head from damage during transport.

But what is it for? Why shouldn’t we just throw it away? And if it’s missing, why is it worth getting one?

If you have one on hand, when and exactly how should you use it?

On the right is the modified, later version for newer drives, which can also be used with older models.

AND WHY ARE THERE EVEN TWO DIFFERENT VERSIONS???

A key characteristic of 5.25" floppy drives is that their read/write heads are relatively sensitive to vibration—it’s simply how they’re built. While vibrations rarely affect the mechanism during normal operation, transport is a different story. Whether you’re carrying the drive to a friend’s place (though this hasn’t been common in recent decades), bidding on one at an auction and waiting for the mail carrier to deliver it, or shipping it to a new owner, the risk is real.

Why is this specific to 5.25" floppy drives? Older 8" floppies rarely had portable versions (and when they were transported, similar protection was needed, though much less frequently), while 3.5" drives have a completely different mechanism and head "parking" system. Interestingly, Commodore originally made similar protective cardboards for 3.5" drives, but they caused more problems (e.g., getting stuck or fraying inside the mechanism) than they solved, so they were quickly discontinued.

The short-lived protective cardboard for 3.5" drives

Returning to the original topic: for "big floppy" drives, the cardboard serves several purposes during transport:

- It prevents the movable read/write head from shifting, protecting it from mechanical damage and misalignment.
- It absorbs shocks and vibrations during transport that could harm delicate mechanical parts, especially the head actuator and rail system.
- It prevents the head from colliding with other parts of the drive or accidentally moving toward the rail endpoints.

The first two points answer a common question: should the cardboard be used with the drive door open or closed? Naturally, closed—because that’s how the head rests on the cardboard. This remains true even if the factory-original cardboard interferes with the door mechanism, making it seem like it’s designed for transport with the door open. That’s a misconception—never transport a drive this way!

The last point is achieved by a small protruding tab on the cardboard, which pushes the head back to the Track 1 position and keeps it there. This is why a proper cardboard is needed, and why a makeshift one cut from printer paper won’t do. If you want to make one at home, use thicker (but not thicker than the disk itself!) cardboard.

If you want to print your own, here’s a printable PDF for the earlier version, and here’s one for the later, universally compatible version.

Of course, many people don’t bother with such earthly trivialities and simply insert an old disk into the drive. This is a compromise solution. It’s better than nothing, but it doesn’t fulfill the third point—moving the head to Track 1. So if you can use the cardboard, stick with it. If not, a disk is still better than nothing, offering at least partial protection.

But only in its original form. Unless you’re cutting down a -02 to make a -03, don’t modify the cardboard! Here’s a bad example of a homemade version you can buy for a hefty price—yet it does no more than an old disk, missing the tab that positions the head. Don’t waste money on this!

A poorly reproduced cardboard based on the 251171-03, but cut down.

For the 1540-1541-1541C-1541 II-1551-1570 line, this much information should suffice. But if you have a 1571 drive, there’s one more important detail.

These relatively modern, double-sided drives naturally have read/write heads both above and below the disk. While Commodore built them to be rock-solid (though the German-made power supplies with built-in, resin-filled noise filters sometimes burn out without warning!), the upper head’s mounting wasn’t entirely successful.

At least not if you expect a device designed for a few years of use to still function flawlessly after 30 years :)

The issue arises because, with the door open, the upper head’s spring remains under constant tension, leading to material fatigue over years or decades of storage. This flaw is irreparable—the entire mechanism must be replaced (which, of course, requires cannibalizing another 1571).

Such a 1571 will no longer be able to read the B-side of disks, making it unusable in C128 mode (or at all). A minor issue, but important if you’re not using it with a C128—it’ll still work perfectly in single-sided mode.

For this reason, it’s advisable to store and transport the 1571 with the door closed, using a protective cardboard insert.

There’s another common variant you might encounter. Based on the Japanese characters, I’d guess it was an accessory for the JPN-mechanism 1541-II, but I don’t have exact details:

Likely a Japanese-origin cardboard

Its usability is rather inconsistent. It fits the 1541-II JPN mechanism but jams in Mitsumi/Newtronics mechanisms. With "buffered" drives, it’s the opposite—it fits Mitsumi/Newtronics but can’t be fully inserted into Alps mechanisms:

Japanese cardboard in a JPN-mechanism 1541-II

Japanese cardboard in a Mitsumi/Newtronics-mechanism 1541

Japanese cardboard in an Alps-mechanism 1541

And to end on a reassuring note after all this panic and warnings:

For Datasettes, Commodore never prescribed any cassette-replacement protective cardboard—you can safely store and transport them without one :)