10774 - read-ahead reads 567

Hi experts

what's the mean: read-ahead reads 567

this completes statistics io:
(1 row(s) affected)
Table 'Contact'. Scan count 1, logical reads 569, physical reads 1, read-ahead reads 567, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Who is Participating?
Vitor MontalvãoMSSQL Senior EngineerCommented:
It's a performance strategy made by SQL Server engine. I think he predicts that the query will need to read those rows so it do it in advance.
The MSDN article can explain it better than me :)
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