[BioC] Memory issue

[Salil]

Hi Group,
 
Iam a beginner in learning R and Bioconductor.
 
I have a basic question. 
How can I increase the memory limit.
 
When I type the command:
 
abatch <- ReadAffy(filenames = myfilenames , phenoData = mypheno)
 
It throws me this error:
 
Error: cannot allocate vector of size 625759 Kb
In addition: Warning message: 
Reached total allocation of 511Mb
 
 
How can I overcome this?
 
Thanks

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