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faqyoutom

Cannot unmount disk to format it

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I failed to install Lion on my pc. Now I am trying to install win8 on it but it wont let me cos of the GPT so I tried to erase my disk to Ms-dos FATso i can install win on it but it stucks at Unmounting disk. I am booting from my DVD

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if you can get into command prompt , run as an administrator, run following commands

diskpart     enter

list disk     enter

you should have lists of hdds on pc as

 

disk0

disk1 ..............check one with gpt partition(for example  disk1)

;etc

 select disk1    enter,    once gpt disk selected

clean enter               and thats all.

if you have another windows pc , you can connect hdd to it and do as above.

hth

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Run your Lion DVD, open Terminal and enter this.

 

sudo diskutil umount -f /Volumes/YourPartitionName

 

Close Terminal, open Disk Utility. (Still in Lion Installer)

Format it FAT, then run Windows DVD and format to NTFS/FAT.

 

Make sure the drive is MBR for Windows DVD as well.

 

* If that Terminal command doesn't work then try: 

sudo diskutil umount force /Volumes/YourPartitionName

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