ERROR ERASING CISCO 2621XM NVRAM

I have a problem with erasing the NVRAM on a CISCO 2621XM


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Router#sh vers
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS3X-M), Version 12.3(16), RELEASE SOFTWARE (fc4)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Tue 23-Aug-05 17:44 by ssearch
Image text-base: 0x80008098, data-base: 0x8184F27C

ROM: System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)
ROM: C2600 Software (C2600-IS3X-M), Version 12.3(16), RELEASE SOFTWARE (fc4)

Router uptime is 31 minutes
System returned to ROM by reload
System image file is "flash:c2600-is3x-mz.123-16.bin"

cisco 2621XM (MPC860P) processor (revision 0x100) with 94208K/4096K bytes of memory.
Processor board ID JAD07150PTU (1031150207)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)
         
Configuration register is 0x2102


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Router#test mem
Testing NVRAM card will remove all files! Continue [y/n] ? y

Warning: This test will result in the loss of the NVRAM configuration!
Continue [y/n] ?
Passed
Router#
*Mar  1 00:32:38.619: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram
*Mar  1 00:32:38.667: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram
*Mar  1 00:32:38.715: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram


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Router#dir all
Directory of system:/

   10  drwx           0                    <no date>  its
    2  dr-x           0                    <no date>  memory
    1  -rw-         622                    <no date>  running-config
    9  dr-x           0                    <no date>  vfiles

No space information available
Directory of nvram:/

%Error opening nvram:/ (Bad file number)

No space information available
Directory of flash:/

    1  -rw-    14962944   Nov 3 2006 13:40:24 +00:00  c2600-is3x-mz.123-16.bin

16252924 bytes total (1289916 bytes free)
Router#
*Mar  1 00:25:03.247: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram
*Mar  1 00:25:03.299: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram

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Router#sh file systems
File Systems:

     Size(b)     Free(b)      Type  Flags  Prefixes
           -           -    opaque     rw   system:
           -           -     nvram     rw   nvram:
           -           -    opaque     rw   null:
           -           -    opaque     ro   xmodem:
           -           -    opaque     ro   ymodem:
           -           -   network     rw   tftp:
*   16252924     1289916     flash     rw   flash:
           -           -   network     rw   rcp:
           -           -   network     rw   pram:
           -           -   network     rw   ftp:
           -           -    opaque     ro   cns:

Router#
*Mar  1 00:25:15.307: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram
*Mar  1 00:25:15.359: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram

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Router#write erase
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
%Error erasing nvram: (Invalid argument)
Router#
*Mar  1 00:36:12.711: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram
*Mar  1 00:36:12.759: %SYS-4-NV_BLOCK_INITFAIL: Unable to initialize the geometry of nvram