Does the router view the 16MB of Flash as one partition?
Do a "show flash all" If there is more than one partition it will show that:
router#sh flash all
Partition   Size    Used      Free      Bank-Size  State          Copy Mode
  1         8192K   6017K     2174K     8192K      Read ONLY      RXBOOT-FLH

  2         8192K      0K     8192K     8192K      Read/Write     Direct
System flash directory, partition 1:
File  Length   Name/status
        addr      fcksum  ccksum
  1   6162068  c2500-d-l_113-11a  
        0x40      0xF28F  0xF28F
[6162132 bytes used, 2226476 available, 8388608 total]
8192K bytes of processor board System flash (Read ONLY)

   Chip    Bank    Code      Size      Name
    1      1       89A0      2048KB    INTEL 28F016SA
    2      1       89A0      2048KB    INTEL 28F016SA
    3      1       89A0      2048KB    INTEL 28F016SA
    4      1       89A0      2048KB    INTEL 28F016SA
Executing current image from System flash partition 1

System flash directory, partition 2:
No files in System flash
[0 bytes used, 8388608 available, 8388608 total]
8192K bytes of processor board System flash (Read/Write)

router(config)#partition flash: 1 16
(I seem to remember that it is best to "wr" to save the config change.)

router#sh flash all
System flash directory:
File  Length   Name/status
        addr      fcksum  ccksum
  1   6162068  c2500-d-l_113-11a  
        0x40      0xF28F  0xF28F
[6162132 bytes used, 10615084 available, 16777216 total]
16384K bytes of processor board System flash (Read ONLY)

   Chip    Bank    Code      Size      Name
    1      1       89A0      2048KB    INTEL 28F016SA
    2      1       89A0      2048KB    INTEL 28F016SA
    3      1       89A0      2048KB    INTEL 28F016SA
    4      1       89A0      2048KB    INTEL 28F016SA
    1      2       89A0      2048KB    INTEL 28F016SA
    2      2       89A0      2048KB    INTEL 28F016SA
    3      2       89A0      2048KB    INTEL 28F016SA
    4      2       89A0      2048KB    INTEL 28F016SA
Executing current image from System flash

> -----Original Message-----
> From: Alex [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, June 10, 2003 8:52 AM
> To: [EMAIL PROTECTED]
> Subject: IOS upload error on 25xx [7:70453]
> 
> 
> Hi
> 
> I was trying to upgrade IOS on 2501 router with 16MB flash 
> and 16MB RAM, new
> IOS image requires 16/16 according to Cisco web site.  Image 
> size is 15,376
> when I upload the image it fails with "memory buffer overflow 
> error".  I
> tried this on different 25xx models same error on all of 
> them.  If anyone
> has any ideas please advice.
> 
> Thanks
> 
> Alex




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