This create a 15Mb file. For any use.
dd if=/dev/random of=BigFile.dat bs=1500000 count=10
Here a loop that generate 10 files of 15MB size.
$ cat MakeBigFile.sh
#!/bin/sh
for i in {1..10}
do
fName="BigFile0$i.dat"
dd if=/dev/random of=$fName bs=1500000 count=10
mv $fName ~/Dropbox/Public/BigFiles/$fName
done
$ ls -lh ~/Dropbox/Public/BigFiles/
total 293040
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile01.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile010.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile02.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile03.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile04.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile05.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile06.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile07.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile08.dat
-rw-r--r-- 1 albertop staff 14M 25 Set 12:38 BigFile09.dat
$
yep!