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Not what you're asking for, but hey, this device http://www.deviceside.com/fc5025.html is different from the standard USB floppy adapters.

Standard is named UFI, spec at https://www.usb.org/sites/default/files/usbmass-ufi10.pdf

UFI does not provide actual low-level access to the drive. It only support a few common floppy formats, like 720kB, 1440kB and therefore not 1.2MB or 360k of the 5.25 inch floppies.

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UFI does actually support 1.2MB! This is because many Japanese computers, like the PC-98, spun their 3.5 inch floppies at 360rpm to match the sector layouts of the 5.25 inch one. Many USB floppy drives support this - if you insert a 3.5 inch disk and format it as 1.2MB you'll hear the pitch of the drive motor change.

It's kind of tricky. UFI does mention 1.25MB, but the table states again "3.5 inch".

So, yes, if you want to format your 1.44MB capable 3.5 inch disks as 1.25MB you can. But still not the 5.25 inch disks the OP is requesting.

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