The GPT specification requires that the first 512 bytes of a disk be reserved as a place-holder, essentially containing an MBR that simply indicates one partition which occupies the whole disk, where a traditional MBR disk usually locates its partition table and boot code. Current Windows Operating Systems require a Master Boot Record formatted disk (one that accurately references all partitions using MBR) to boot from. Intel developed the latter for use with Itanium-based systems, but if you’re interested in a more elaborate explanation please look here:A GPT formatted disk does not contain a “real” Master Boot Record. An Intel-based Mac uses Extensible Firmware Interface (EFI) with a GUID Partition Table (GPT) formatted disk.It will show you an effectively “empty” partition table:Running the above command on a machine that does not contain a “Boot Camp” partition will result in a listing of an effectively empty disk. Open Terminal, and run fdisk on the boot disk (normally /dev/rdisk0) to see the MBR. The Boot Camp utility simply uses this utility “under the hood” to make this easy for the average user.Let’s take an average Intel-based Mac, running with a single hard disk formatted as a GPT disk (the default).You should adjust as necessary, and, for goodness sake, make a backup with Time Machine before you change a thing!Now, if you run “ sudo fdisk /dev/rdisk0 “, you’ll see that there is now a Master Boot Record on the GPT-formatted disk. The “Win7” volume is formatted as FAT by default, but can easily be changed later when installing Windows.In your case, the disk sizes and volume free space may vary. Note that 65 GB is actually somewhat smaller than the actual resultant partition/volume size, but diskutil automatically sizes the last specified partition/volume to occupy available contiguous free space.After running this, I have a 250 GB volume for OS X, and a 69.73 GB volume for Windows 7. Then an additional partition is created, along with a Master Boot Record, with the “MS-DOS” filesystem option, the “Win7” volume label, and the “65G” size specification.
Space For Windows Partition On Mac Uses ExtensibleI was able to get everything working quite nicely by putting in the Snow Leopard CD while booted to Windows, copying the drivers folder to my C: drive, running an elevated command prompt, and using “msiexec.exe /i bootcamp64.msi” to run the installer directly out of the “Apple” folder. In my case, I chose to install Windows 7 64-bit, and this required a bit of extra work to get the drivers installed as it is not officially supported on my model. This re-formats the “MS-DOS” volume from FAT to NTFS.Once Windows is installed you will of course need to install “Boot Camp” drivers. You will need to select this partition, choose advanced drive options, and select Format to make it available for installation. In my case, and the case of most “Boot Camp” users, this will be “Disk 0 Partition 3”. Have serial number for cs6 but incorrect login adobe macLet’s assume it’s /dev/disk1. Again, use diskutil list to find the disk identifier. Let’s assume for this that you’re working with a Mac with a 320GB disk booted up in Target Disk Mode, connected via Firewire to the Mac on which you’re running Terminal. For this you use the diskutil “partitiondisk” option. In most cases, this is as simple as replacing /dev/disk0 with /dev/disk1 or /dev/disk2 , etc.If you wish to use Terminal to perform the initial partitioning of a disk (completely wiping the disk’s contents), and include the “Boot Camp” partition from the beginning, you can do that as well. For example, have you ever wanted to create the “Boot Camp” partition while booted to the OS X installation media (using Terminal)? Or perhaps pre-create partitions on a USB disk or a Mac running in Target Disk Mode? Simply modify the device identifier as appropriate (again, use: diskutil list), and you’re in business. The second will be the size of the remaining free space (which must be greater than or equal to 65G for the syntax in my command to work), formatted as FAT, and labeled WIN7. The first will be 250GB, formatted as Journaled HFS+, and labeled MACHD.
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