Bad disk determination

Managers,

I have a sun v120 with mirrored disks that after being rebooted did not
come up. I believe that one disk had died without notice and since this
was the boot disk it was only noticed then. The issue I'm having is that
the disk is detectable but I am unable to format it. I have googled
around but have been unable to find anything useful and would like to
know if the disk is indeed dead or if I'm missing some other issue. Any
responses would be greatly appreciated.

Thanks in advanced.

format
Searching for disks...done


AVAILABLE DISK SELECTIONS:
0. c1t0d0 <drive type unknown>
/pci at 1f,0/pci at 1/scsi at 8/sd at 0,0
1. c1t1d0 <SUN36G cyl 24620 alt 2 hd 27 sec 107>
/pci at 1f,0/pci at 1/scsi at 8/sd at 1,0
Specify disk (enter its number): 0



AVAILABLE DRIVE TYPES:
0. Auto configure
1. Quantum ProDrive 80S
2. Quantum ProDrive 105S
3. CDC Wren IV 94171-344
4. SUN0104
5. SUN0207
6. SUN0327
7. SUN0340
8. SUN0424
9. SUN0535
10. SUN0669
11. SUN1.0G
12. SUN1.05
13. SUN1.3G
14. SUN2.1G
15. SUN2.9G
16. Zip 100
17. Zip 250
18. SUN36G
19. other
Specify disk type (enter its number): 18
selecting c1t0d0
[disk unformatted]


FORMAT MENU:
disk - select a disk
type - select (define) a disk type
partition - select (define) a partition table
current - describe the current disk
format - format and analyze the disk
repair - repair a defective sector
label - write label to the disk
analyze - surface analysis
defect - defect list management
backup - search for backup labels
verify - read and display labels
save - save new disk/partition definitions
inquiry - show vendor, product and revision
volname - set 8-character volume name
!<cmd> - execute <cmd>, then return
quit
format> inquiry
Vendor: SEAGATE
Product: ST336607LSUN36G
Revision: 0307
format> format
Ready to format. Formatting cannot be interrupted
and takes 332 minutes (estimated). Continue? yes
Beginning format. The current time is Wed Mar 2 22:57:22 2005

Reserve failed
failed
format>

[2984 byte] By [CodeProf.com] at [2008-1-7 0:21:00]