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I have a 4.04GB DMG file for Mac OS X 10.8 (Mountain Lion), which is being used for reinstalling the OS on my MacBook Pro.

However, the bootable USB needs a GPT (GUID-partition table) format. The only compatible format is FAT32, which supports a maximum of 4.00 GB per partition.

Is there any way to compress the DMG file to be smaller than 4GB, or booting from an ISO file?

I'm using Windows 7 on an HP Pavilion laptop. The .img file is 4.04 GB, and I need to copy that file to a USB stick that supports it. What format should I use in my 32 GB SanDisk USB stick while on the Windows 7 computer in order to read/write?

Alfredo Barreto
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simply format your boot USB Stick with exFAT which can handle >4GB files fine and will be recognized by UEFI (and BIOS). just tested with and quite old MacBook Air

Falco Alexander
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