creating hdd images for os development

P

pbleisch

Bit poster
I'd like to use Parallels for hobby OS development. I have a bootloader to go into the MBR of an HDD image. I've been using the following script to create the an image of the harddrive. I'm using dd to create the image from the DMG based on several posts on these forums as well as http://kb.parallels.com/en/5403 However, when I try to use the resulting .hdd, Parallels 6 complains that the image is corrupt and the HDD fails to attach when booting the vm. The dmg image looks good using diskutil, fdisk, etc...

Thoughts about what I'm missing?

Thanks!

-- begin mkhdd --
#!/bin/sh

HDDDMG=$1
DIRS=$2
MBR=$3

hdiutil create -megabytes 16 -volname "OZBOOT" -format UDRW -layout MBRSPUD -srcfolder $DIRS -ov -fs MS-DOS $HDDDMG
DEVICE=$(basename $(hdiutil attach $HDDDMG -nomount -noverify | head -1))
echo device is at $DEVICE
echo fdisk -u -f $3 -y /dev/$DEVICE
fdisk -u -f $3 -y /dev/$DEVICE
dd if=/dev/$DEVICE of=oz.hdd
hdiutil detach $DEVICE
 
A little more information. I've confirmed that I get the same error when trying to use it as an HDD image ("The specified hard disk image file is invalid. Do you want to save the virtual machine configuration anyway?") even if I remove the fdisk command which removes any MBR of mine.
 
Any thoughts here? I've also tried letting Parallels create the harddrive in a new VM and then modifying the DiskDescriptor.xml afterwards to be a plain drive of the right size (CHS, etc...) but that fails as well when trying to open the disk on VM boot.

Does Parallels have a minimum HDD size that it supports?
 
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