The driver is still there, but it's no longer registered. You should boot from an alternate boot environment, use beadm mount to mount the broken BE, and then use add_drv -b to re-add the driver(s) that were unregistered. The boot into the fixed BE will probably require the -r option to initiate a device reconfiguration.
Than-you for your response..
booted it from alternate BE,
used beadm to mount the broke BE to the created /a directory
used add_drv -b to re-add the drive.. drive ata was successfuly re-installed
boot it to the fixed BE .. is booting over and over and over...
I am probably doing something wrong .. any ideas?
I appreciate your help
Can you provide the boot error message?
Dave mentioned that you would probably need to do a boot -r to do a reconfiguration boot. Did you try that?