#!/bin/sh
# Create a disk image containing some (text) data.

if [ $# -eq 0 ]
then
  echo "Fill disk of some capacity (in ~1 MB units) from stdin"
  echo "usage: image-data capacity"
  exit 1
fi

dd if=/dev/zero of=data.img count=$(($1*2016))  # 32 tracks * 63 sectors/track of 512-byte sectors
dd of=data.img conv=notrunc