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linux64-bitddfedora20

Why is dd command limiting dummy file size at 2GB?

I'm just curious about why the dd command is limiting the size of a dummy file to about 2.1GB

[aesteban@localhost ~]$ dd if=/dev/zero of=test.img bs=3G count=1
0+1 records in
0+1 records out
2147479552 bytes (2.1 GB) copied, 10.0044 s, 215 MB/s
[aesteban@localhost ~]$ ls -sh test.img 
2.0G test.img

I seen above I specified 3GB but the file is only 2.1GB, any ideas ?

Thanks

Solution

  • I can suppose that that's a limitation of dd buffer size, just try to split it by setting bs=1Gb count=3