I have hdd.img file, which I user as HDD for my virtual machine, but it's size is too small, how can I enlarge it?There is one method, something like:dd if=/dev/zero ds=10GB count=8 >> hdd.imgbut it takes a lot of time :( 
How to enlarge existing file to specific size
virtual machine;dd
Something like that:dd if=/dev/zero bs=1 seek=new_filesize count=0 of=your_fileFor example this:dd if=/dev/zero bs=1G seek=1000 count=0 of=testwill enlarge file test to 1000G