Anyone know the rotation speed of this FDD?

Hi, I have a Sony MP-F52W-30 floppy disk drive, which I need to replace - it semi worked until recently (would read but not write) until I zapped it by accident. It comes from an HP 1650B logic analyzer - does anyone know if it's a 600rpm or a standard 300rpm device? If it's a 600rpm then I've found someone who has one but wants a lot for it, otherwise I'm reasonably sure I can modify the cable connections to use a standard/modern drive. On the motherboard side, it has a Zilog Z0765A FDC, and I've successfully created disks on my PC (using HP's LIFUTIL) that worked on the drive. This makes me think that the drive is a standard 300rpm. Any thoughts? Curiously the serial number label indicates the drive as a MFD-52W-10, while the bigger label on the bottom of the unit shows MP-F52W-30. I guess that the MFD is a base which is then modified to HP's specs (MP-F). BTW Does anyone know what the -10, -30 suffixes mean? I've also seen -00D and -01D around as well. Thanks in advance Peter