help about ReadAffy() erro

 when I type the command
Data<-ReadAffy()
Error: cannot allocate vector of size 831.6 Mb

my system is ArchLinux ,and
free the memory infomation like this
  total       used       free     shared    buffers     cached
Mem:       2075116    1980384      94732          0      94840    1030020
-/+ buffers/cache:     855524    1219592
Swap:      2048248     226472    1821776

what can I  do if I want to read the cel files one time?
 thans .
melody

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