Not amiga compatible 2.5" hard disks?

[PG]

Hi,

I have some 2.5" hard disks that i have problems with together with my amiga 1200. (Kickstart 3.0)
My Hitachi DK222A-54 for example.
When i start the computer it doesnt boot from the hard disk, instead the computer immediately ask for the workbench disk.
I have to reboot the computer for it to find the hard disk and then everythings ok.
Can anyone explain to me why this happen and is there any solution to this problem..?
Thanks in advance for any help! :-)

[PG]

Thanks for your help!
If i change my Roms to 3.1, do i also have to upgrade to workbench 3.1 or higher, or can i continue to use 3.0 without any problems?