Booting from USB floppy

Hi all,

I am trying to boot QNX from USB floppy drive. It is work, but it is
very very slowly (10 min booting time). (I have USB Storage device: NEC
USB UF000x )

I created floppy disk with command.
dinit -N -F -f myfloppy.ifs /dev/fd0
In this case ipl-diskpc2-flop is used.

myfloppy.ifs file has size 1355180.

Have somebody experience with it ? Should I to try other device,or
change some magic parameter in BIOS, or looking for other ipl loader ?