problem with SCSI disk

[RJ45]

Hello I run FreeBSD 5.2/alpha on XP1000

I have 3 scsi disk, one of the disks I don't know why is not working.
it is not seen by sysinstall and when I try to do 

sauron# disklabel -e da2
disklabel: /dev/da2: no valid label found

GEOM: create disk da2 dp=0xfffffc0000cfe068
da2 at isp0 bus 0 target 2 lun 0
da2: <MAXTOR ATLAS10K4_36WLS DFL0> Fixed Direct Access SCSI-3 device 
da2: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing
Enabled
da2: 35074MB (71833096 512 byte sectors: 255H 63S/T 4471C)


the disk is seen by the kernel.

how come I am not able to label it ?

the /dev/da2 file is present.

any hints?
thank you

Rick