HI I am runnig WGCNA code for calculating co expression adjacency Matrix but I am getting this error I am running this scrip in C directory and it has 60 Gb free space so why it still gives this error 

> coexpression<-adjacency(data)
Error: cannot allocate vector of size 28.7 Gb
In addition: Warning messages:
1: In cor(datExpr, use = "p") :
  Reached total allocation of 3810Mb: see help(memory.size)
2: In cor(datExpr, use = "p

The error isn't talking about disk space, it's talking about RAM. If you are really close to your memory limits you might be able to do some things to squeak by, but in general the only recourse is to add RAM or use a computer with more RAM.