Can't add disk to failed raid array

[Paul Waldo <pwaldo@waldoware.com>]

Hi all,

I have a RAID6 array where a disk went bad.  I removed the old disk, put in an 
identical one, and repartitioned the new disk.  I am now trying to add the 
new partition to the array, but I get this error: 

[root@paul ~]# mdadm --add /dev/md1  /dev/hdd2
mdadm: add new device failed for /dev/hdd2 as 2: Invalid argument

When I perform that command, /var/log/messages says this:
Jul 15 20:48:39 paul kernel: md: hdd2 has invalid sb, not importing!
Jul 15 20:48:39 paul kernel: md: md_import_device returned -22


Below is the relevant data.  What might I be doing wrong?  Thanks in advance!

Paul

[root@paul ~]# cat /proc/mdstat
Personalities : [raid6] [raid1]
md0 : active raid1 hdd1[6](S) hda1[0] hdc1[1] hde1[2](S) hdg1[3](S) sda1[4](S) 
sdb1[5](S)
      979840 blocks [2/2] [UU]

md1 : active raid6 sdb2[6] sda2[5] hdg2[4] hde2[3] hdc2[1] hda2[0]
      776541440 blocks level 6, 256k chunk, algorithm 2 [7/6] [UU_UUUU]

unused devices: <none>
[root@paul ~]# fdisk -l /dev/hdd

Disk /dev/hdd: 160.0 GB, 160029999616 bytes
255 heads, 63 sectors/track, 19455 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdd1               1         122      979933+  fd  Linux raid autodetect
/dev/hdd2             123       19455   155292322+  fd  Linux raid autodetect

[root@paul log]# mdadm --detail /dev/md1
/dev/md1:
        Version : 00.90.03
  Creation Time : Fri Jun 23 22:35:27 2006
     Raid Level : raid6
     Array Size : 776541440 (740.57 GiB 795.18 GB)
    Device Size : 155308288 (148.11 GiB 159.04 GB)
   Raid Devices : 7
  Total Devices : 6
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Sat Jul 15 20:53:29 2006
          State : clean, degraded
 Active Devices : 6
Working Devices : 6
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 256K

           UUID : 2e316d9e:20cac82a:2555918e:bb9acc07
         Events : 0.1396384

    Number   Major   Minor   RaidDevice State
       0       3        2        0      active sync   /dev/hda2
       1      22        2        1      active sync   /dev/hdc2
   3157553       0        0        5      removed
       3      33        2        3      active sync   /dev/hde2
       4      34        2        4      active sync   /dev/hdg2
       5       8        2        5      active sync   /dev/sda2
       6       8       18        6      active sync   /dev/sdb2

[root@paul log]# uname -rv
2.6.17-1.2139_FC5 #1 Fri Jun 23 12:40:16 EDT 2006