the speed is about 500MB/s on my machine. i think it's fast enough to output not too many bytes. while a C program may output 1GB per sencond on my machine. if the size is not the power of 512,you may change the bs and count in dd. Show Sample Output
if the fs support sparse file,using truncate can create sparse file. http://en.wikipedia.org/wiki/Sparse_file
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