0 bootable partitions found

hey,
i created an empty disk image using :
dd if=/dev/zero of=myharddisk.img bs=516096 seek=6241 count=0
but it's saying 0 bootable partitions found !

here's my config file ! or at least a part of it !

pci_ide0_master_installed = 1
pci_ide0_master_image = "/home/taha/harddisk.img"
pci_ide0_master_type = "hd"

pci_ide0_slave_installed = 0
pci_ide0_slave_image = "/home/taha/Bureau/Mac OS X Install DVD.iso"
pci_ide0_slave_type = "cdrom"

thank you !

--

-- 
Taha

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