6994 Views 8 Replies Latest reply: Dec 3, 2009 6:49 PM by paxprobellum
I can't seem to get Disk Utility to burn a CD to my USB flash drive. I've tried using a disk image as well as the physical CD. I always get this error:
2009-12-02 19:48:02 -0600: Validating source...
2009-12-02 19:48:02 -0600: Could not detect format of volume on device /dev/disk2s0
2009-12-02 19:48:02 -0600: Could not validate source - error 254
Any ideas how to fix this? Things I've tried:
1) Converting .iso to .dmg with Disk Utility
2) Converting .iso to .dmg with DmgConverter
3) Every combination of mounted/unmounted
The idea of burning a CD to a flash drive sounds bizarre. Can you explain what you're really trying to do?
Basically, I'd like to install Windows without using my optical drive. I think it is malfunctioning, and I'm getting odd behavior when I use cds/dvds. Also, I'm just in it for the thrill of the technology. I thought it would be simple...
I decided to up the ante, and pulled out a harddrive I had put into an enclosure. I still get the same error. The hard drive is formatted Mac OS Extended (Journaled). My disk image is ISO 9660.
Joliet is the name of an extension to the ISO 9660 file system. It has been specified and endorsed by Microsoft and has been supported by all versions of its Windows OS since Windows 95 and Windows NT. Its primary focus is the relaxation of the filename restrictions inherent with full ISO 9660 compliance.
You are probably wondering why it is not as easy to create a bootable flash drive from a windows
disk as it is from an OS X install disk.
The reason is, Apple uses basically the same file system (HFS) on their install DVD's as they use
on their Hard drives (HFS+).
Creating a bootable Apple OS X flash drive from an install DVD is as simple as formatting the USB
drive as HFS in Disk utility and then using CCC (Carbon Copy Cloner) to create a clone of your
Install DVD and place it on the flash drive.
Creating a Windows installation flash drive is possible,
but is a bit more difficult and even if you did, it don't know if it will boot on a Mac through
the USB port.
The problem is Macs don't support Bios booting except through boot camp. Macs do support
CD booting (el torito), and that is why Macs can install windows from CD's.
You might could place windows on a boot camp partition (GUID) setup on your flash drive, and
if you can pull that trick off, I will certainly take my hat off to you.
Thanks for the very useful information. You certainly cleared up a bit of file system confusion I was having. I am still planning to create the disk. My plan is to create a GUID partition from my mac, then clone the windows install disk onto the drive from my windows computer. Before I go through the trouble, I'm going to make sure the volume I use (either a flash drive or USB external) is bootable. I assume any powered GUID partition should be available -- I've heard mixed reports with flash drives.
Where is your sense of adventure? :P
I admire your persistence.
The biggest "fly in the ointment" is going to be getting the that little critter to boot. In other
words getting the boot sector functional. The challenge to that is getting windows to correctly
write the boot sector to a GPT (GUID) formatted drive. Only the latest windows (XP SP2 and later)
understand GPT, Dos based utilities don't have a clue, and will not write a boot sector that
Here is some more invaluable info:
Macs do support booting from a straight MBR partition (Hard Disk). Try formatting your thumb
drive with fat32 first and make it bootable with dos or something. Hook it to your Mac and see
if it will boot from it. If it does, you are home free (maybe), if not you will have to use the GPT
route. There is one possible snag though, even if you can successfully boot an MBR only partition,
without the GPT interface the only drive Dos/Windows may be able to see is the drive you booted
from. I don't have an answer for you. I have booted from dos and was not able to see any drives.
The problem is the "A20" line, which Dos needs to manipulate the hard disk controller does not
exist on a Mac. I don't think Windows (XP SP2 and later) requires the "A20" line. Maybe one of the
"linux geeks" can jump in here and enlighten you further on the firmware/MBR/GPT interface
workings and relationships.
I might be wrong, but I believe you will need GPT to be able to access your Mac's hard disk
controller so that you can install windows on the boot camp partition. Even if you get your
thumb drive to boot without GPT, it would be useless if you could not access the hard disk
on your Mac.
Thanks for the link. I had previous made a rEFIt disc for a different reason, but I must have missed that page when I was looking over their site (or maybe it is newer than my last visit). In any event, it is good news to me that you can boot a mac from an MBR partition. Seems like it stands to reason that you would be able to load it as a start volume.
Also, I was running my external off of USB. It also has firewire capabilities, so I'm going to play around with that. Seems like firewire gets preferential treatment at startup. I'll post again when I've got something useful to say