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From: Tom Roche <Tom_Roche@pobox.com>
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Date: Sat, 22 Mar 2014 01:26:02 -0400
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Subject: Re: [dm-crypt] `cryptsetup luksFormat` fails: "Cannot wipe header
	on device"
Reply-To: dm-crypt@saout.de, Tom Roche <Tom_Roche@pobox.com>
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http://www.saout.de/pipermail/dm-crypt/2014-March/004050.html
[Tom Roche Thu, 20 Mar 2014 20:59:27 -0400]
>> [...] I'm attempting to install to an extended partition. E.g., do I need to
>> create a logical partition=/dev/sda5 inside the extended partition=/dev/sda4 ?

http://www.saout.de/pipermail/dm-crypt/2014-March/004051.html
[Arno Wagner Fri, 21 Mar 2014 06:07:26 +0100]
> [either that or] Make sda4 a primary partition (thereby making yourself
> unable to create any [additional] partitions

Yep, logical partition fixed, thanks.

While I'm here, a `cryptsetup luksFormat` feature request: if possible, It Would Be Nice to implement a test of the target partition that gave the user more useful feedback than is currently provided. Extra credit for failing before passphrase typing :-)

thanks again, Tom Roche <Tom_Roche@pobox.com>