Replace 3.5" drives in HP9122D/HP9133H

I am wondering whether it is possible to replace the ailing Sony 3.5" disc drives in both my HP9122D and HP9133H HP-IB units with PC 3.5" drives? These are the older Sony 3/4 height units with separate data & power connectors, model OA-D32W-10 (double sided). The data connector has 26 pins. The power connector is standard 4 pin. I located the pin-outs for these drives on a Japanese site, and found that I could match all but 3 signals to a 'standard' 3.5" disc drive: SONY OA-D32W-10 STANDARD 1 Motor On -----> 10 /MOTEA - 0=Motor Enable Drive 0 2 Drive Select 0 -----> 14 /DRVSB - Drive Select 0 3 Disk Change -----> 34 /DSKCHG - 1=Disk Change/0=Ready 4 Drive Select 1 -----> 12 /DRVSB - Drive Select 1 5 Disk Change Reset -----> ???? 6 Direction Select -----> 18 /DIR - 0=Direction Select 7 GND -----> GND 8 Step -----> 20 /Step - 0=Head Step 9 GND -----> GND 10 Write Data -----> 22 /WDATE - Write Data 11 GND -----> GND 12 Write Gate -----> 24 /WGATE - Floppy Write Enable, 0=Write Gate 13 GND -----> GND 14 Head Read -----> ???? 15 GND -----> GND 16 Head Select -----> 32 /SIDE1 - 0=Head Select 17 GND -----> GND 18 Index -----> 8 /Index - 0=Index 19 GND -----> GND 20 Track 00 -----> 26 /TRK00 - 0=Track 00 21 GND -----> GND 22 Write Protected -----> 28 /WPT - 0=Write Protect 23 GND -----> GND 24 Read Data -----> 30 /RDATA - Read Data 25 GND -----> GND 26 Ready -----> ???? Is such a retro-fitting exercise possible? One possible problem could be the rotational speed; I know the Sony drives spun at 600rpm as opposed to the PC standard 300rpm... Any comments and/or suggestions about the feasibility, as well as matching the signals of pins 5, 14, and 26? Cheers Glen.