Akai S1000 / S1100 samplers

Hello all, i just got an S1000HD with a very dead internal hard drive 
(about as big as my head) but a with brand new backlight and screen 
for a grand total of £38!!
Anyway, i've linked it up to my Jaz drive and finally got the v4.40 
operating system onto it with a bit of trashing around through MS-DOS 
(why don't AKAI make it work on XP?) but i seem to be having a bit of 
trouble booting it up to 4.40 from the jaz drive. Sometimes it works 
and sometimes it ignores the OS on vol-1 partition-A and just boots 
up to 1.10 although i can access the Jaz drive normally when this 
happens. Is this likely to be something dodgy with the SCSI card? Any 
ideas?
One other question, would anyone recommend a certain brand of floppy 
disk and are DD disks more reliable than HD in S1000's? My floppy 
drive seems to be very picky about what brands of floppy its willing 
to use, about 50% of the time i'll format a disk and it'll say 
something along the lines of 'format completed but disk may be 
unreliable'. Format it again and it seems to work fine. I also had a 
lot of trouble finding a floppy that the AKAI would actually boot the 
new OS from so i could get it onto the Jaz drive. New floppy drive 
time?