# creates a sparsebundle disk image with a 128MB band size
MACHINE_NAME=your-machine-name
echo $MACHINE_NAME
hdiutil create -size 900g -type SPARSEBUNDLE -nospotlight -volname "Backup of $MACHINE_NAME" -fs "Case-sensitive Journaled HFS+" -imagekey sparse-band-size=262144 -verbose ./$MACHINE_NAME.sparsebundle