I used BrowserUk's sub to generate the data. On the key part is was 40bytes long, but on the data part it was 320bytes, so I 'substr' it to 80 ... 
$data = substr(rndStr(80,qw[a c g t]),0,80));

[download]

Sorry, but you must have typo'd or c&p'd my code incorrectly, because there should be no need to substr the output of rndStr(): 

sub rndStr{ join'', @_[ map{ rand @_ } 1 .. shift ] };;

$x = rndStr( 80, qw[a c g t] );;

print length $x, ':', $x;;
80 : actaatcttgcgccgcggcttcatacgagatgaatagtacgaaaacttggatacacctgtatcat
+agaagggccgctgcg

[download]
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re^4: Efficient way to handle huge number of records? by BrowserUk
in thread Efficient way to handle huge number of records? by Anonymous Monk

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