"need a quick hashing method"

[Paul Tader]

On Nov 22, 2010, at 6:58 AM, Loïc Grenié <loic.grenie at gmail.com>  
wrote:

> 2010/11/22 Arthur Bela <jozsi.avadkan at gmail.com>:
>> HDD#1
>> HDD#2
>>
>> I copy files between HDD#1 and HDD#2.
>>
>> When i finish, i need a quick "hasing method" - i just want to check,
>> that the copy was 100% ok.
>>
>> md5sum, sha256sum is slow -> are there any "very fast" hash  
>> algoritms?
>> - just for checking if the copied file is corrupt or not [i just need
>> to know, if there were even 1 Byte error when copying]
>>
>> i can write the script, that checks the files, i just need a hash
>> algoritm [""software/command""], that is fast enough.
>
>    Since you want to verify everything, the best you can do is just
>  to use diff. No hashing, just reading the data and comparing
>  (which is more than 10000 times faster than the reading on the
>  disks, thus negligible).
>
>       Hope this helps,
>
>              Loïc
>
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Or you might want to use the rsync command and it's checksum (-c)  
switch.