If your filesystem supports sparse files, you don't need to write it all, one byte will do:
$ rm -f xx ; perl -wE'open$a,">","xx";seek$a,1048575,0;print$a "x"' ;
+ls -l xx
-rw-rw-rw- 1 merijn users 1048576 May 3 09:59 xx
Enjoy, Have FUN! H.Merijn
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