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|
#!/bin/bash
# ***********************************
# * Plex86 Empty Disk Image Utility *
# * *
# * by *
# * *
# * Eric Laberge *
# * *
# * v. 20011123 *
# ***********************************
MBR_DATA="`dirname $0`/mbrdata"
# *** Standard CHS, limit 504MB ***
MAX_C=1024
MAX_H=16
MAX_S=63
B_PER_S=512
MAX_SIZE=$(($MAX_C * $MAX_H * $MAX_S * $B_PER_S))
SPARSE=no
if [ "$1" = "-s" ]
then
SPARSE=yes
shift
fi
# $1 : File, $2 : Size
if [ -z $1 ] || [ -z $2 ] || [ `echo $2 | grep "[^0-9]" | wc -l` -gt 0 ]
then
echo "Usage:"
echo "$0 [-s] file size"
echo " -s : Create sparse image"
echo " file : File name"
echo " size : Requested size (MB)"
exit 1
fi
REQ_SIZE=$(($2 * 1024 * 1024))
if [ $REQ_SIZE -gt $MAX_SIZE ]
then
echo "Warning: exceding 1024 cylinders barrier!"
fi
SIZE=$(($REQ_SIZE / $B_PER_S))
C=$(($SIZE / ($MAX_H * $MAX_S)))
H=$MAX_H
S=$MAX_S
BLOCKS=$(($C * $H * $S))
SIZE=$(($BLOCKS * $B_PER_S))
echo "Disk Geometry:"
echo "C: $C"
echo "H: $H"
echo "S: $S"
echo "Total size: $SIZE bytes"
if [ "$SPARSE" = "yes" ]
then
dd if=/dev/zero of=$1 bs=$B_PER_S seek=$(($BLOCKS-1)) count=1 2> /dev/null
else
dd if=/dev/zero of=$1 bs=$B_PER_S count=$BLOCKS 2> /dev/null
fi
if [ -e $MBR_DATA ]
then
dd if=$MBR_DATA of=$1 bs=$B_PER_S count=1 conv=notrunc 2> /dev/null
echo "Wrote master boot record from file $MBR_DATA"
fi
exit 0
|
