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Install Windows 7 on external drive using Boot Camp (Lion)
Authored by: hynek on Feb 27, '13 11:45:00PM

I have installed Win7 on a external Thunderbolt GoFlex Drive using BootCamp as described, it works, but you may not delete the minimal 20GB Bootcamp partition.

@gabester: Technically you are right, but if I start the Win7 installer directly without using Bootcamp, I am not allowed to install it on any partition (independent of partition map, why? I do not know)

As further info, I was not able to install Win7 onto a GUID partitioned disc, only by deleting the small 200MB Efi Partition you can produce a new Win7 installable partition, but this becomes then Masterblock partition.

@awado: true, but once you delete the internal Bootcamp partition the external Win7 is not bootable, even if you can and do select it from the startup menu it does not boot anymore.

furthermore, repartitioning the internal drive with bootcamp does not make the external drive accessible again, I suspect there is an entry in the EFI partition which is configured by the Bootcamp Assistant. I suppose this external Win7 partition will not work on another Thunderbolt Mac without doing the complete mumbo jumbo (not tested yet).

Loosing 20GB does not sound as much, but on my MacBookAir SSD every GB is valuable, maybe somebody has a good idea to save this inert partition, without loosing the access to the external Win7 partition.

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