checksum problem with downloaded disk images

[Richard Peskin]

The problem is not hardware, memory or ethernet cables, etc. I have  
eliminated these by testing, replacing cables, etc. Also, I booted a  
backup OS X (firewire) disk with an identical OS and the problem  
disappears. The disk that contains the problematic copy of the OS has  
been checked and is OK. Clearly there is something wrong in OS copy  
on the disk I usually use. Anyone have an idea of where I should look  
in the OS?
thanks,
--dick  peskin
On Jan 18, 2007, at 3:19 PM, Matt Elliott wrote:

> I'd start with replacing your ethernet cable, or switching your  
> ethernet connection with one from a computer that does work. You  
> are getting data corruption that could be on the network on in the  
> memory of the computer.  Switching network connections should let  
> you isolate it to the network or the computer.
>
> (Network could be cable, switch, switch port.)
> (Computer could be ram, cpu, disk, or disk cable.)
>
>
> On Jan 18, 2007, at 1:49 PM, Richard Peskin wrote:
>
>> I am getting consistent checksum validation failure for dmg files  
>> downloaded. It is appearing for any dmg files I try to download  
>> with any browser or with curl. BUT the problem is present only on  
>> one workstation. Other computers on the same network using the  
>> same interface to the internet do not have the problem. Here is a  
>> typical hdiutil report for a download of Flip4Mac WM components:
>> -------
>> [harvey:~] rpeskin% hdiutil attach /Volumes/Users/rpeskin/Desktop/ 
>> WM\ Components\ 2.1.dmg
>> Checksumming Driver Descriptor Map (DDM : 0)...
>>      Driver Descriptor Map (DDM : 0): verified   CRC32 $20D8AE53
>> Checksumming Apple (Apple_partition_map : 1)...
>>      Apple (Apple_partition_map : 1): verified   CRC32 $423E23CB
>> Checksumming disk image (Apple_HFS : 2)...
>> ..................................................................... 
>> .........
>>           disk image (Apple_HFS : 2): calculated CRC32 $065CD088,  
>> expected   CRC32 $70C682B5
>> Checksumming  (Apple_Free : 3)...
>>                     (Apple_Free : 3): verified   CRC32 $00000000
>> calculated CRC32 $4CD17028, expected   CRC32 $75A11486
>> hdiutil: attach failed - invalid checksum
>> -------------------
>> Where do I look for a solution to this problem?
>> thanks,
>> --dick peskin
>>
>>
>>
>>
>> ____________________________________
>> Richard L. Peskin, RLP Consulting, Londonderry, VT
>> http://www.rlpcon.com
>> http://www.caip.rutgers.edu/~peskin
>>
>>
>>
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____________________________________
Richard L. Peskin, RLP Consulting, Londonderry, VT
http://www.rlpcon.com
http://www.caip.rutgers.edu/~peskin