Alrighty, finally got my Mitsumi Slim USB Drive in the mail.
Got this exact one so i can confirm it works with 720k floppies:
K1 Mitsumi Slim External USB 2.0 1.1 1.44MB Floppy Disk Drive PC Laptop NotebookNote: This has the EXACT same brown box as the one Mochilote has pictures off, so i assume its the same drive.
Anyways, i can confirm that it supports 720k floppies as i was able to format them on my Windows 7 pc with the tool Dcdrac linked to (thanks buddy):
http://www.denispetrov.com/format144/format720.exeWrote the TestDSK to 3,5" and ran it on my 6128 (uk version) to make sure the whole thing worked
Quick "Tutorial":
1. Plugged the usb-drive into a usb port on the pc and Windows 7 installed it automaticly so i didnt need to use any drivers from the supplied mini-cd-r or need any help from the small "manual" that is included. Note that just like DVD drives and media cards the floppy drive dont appear in Explorer untill a medium is inserted (but you can still see the empty drive from My Computer of cause).
2. Double clicked on the Format720.exe and it asked to insert a floppy to be formatted.
3. Inserted a DD 720k floppy in the drive.
4. Pressed "Any key" and let it do its work. Pressed space to exit the program.
5. Ran CPCDiskXP and clicked on the "DSK to disc" button. Clicked on "Open" and chose the TESTDSK file. Chose "USB Floppy Drive" as write method. Finally clicked on Write Disk to begin the write.
6. Inserted the floppy into my 6128 external 3,5" drive, flicked the ABBA switch to make it appear as A: drive and loaded the game.
7. Got confused by the odd controls in Abadia Del Crimen