Date: Wed, 23 Feb 2011 01:10:12 -0800 From: perryh@pluto.rain.com To: petefrench@ingresso.co.uk, lists@c0mplx.org Cc: freebsd-stable@freebsd.org Subject: Re: 3TB disc and block alignment Message-ID: <4d64cef4.8Viwa9MksENBCcLO%perryh@pluto.rain.com> In-Reply-To: <E1Prruj-000D2F-ML@dilbert.ticketswitch.com> References: <E1Prruj-000D2F-ML@dilbert.ticketswitch.com>
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Pete French <petefrench@ingresso.co.uk> wrote: > > Why may it hurt ? How may it hurt ? Which sector is written to > > by this 'gpart' command ? > > > > As far as I understand, GPT writes some stuff at the beginning > > and the end of the harddisk. > > Yup, this is true. > > > How/why will the newfs overwrite those parts ? > > Because you are also giving it the whole hard disc to write to, > instead of a partition within the hard disc, so you will end up > scribbling on what you wrote with the gpart command. Certainly the _correct_ thing to do is to create a partition, and newfs that. However, it's not entirely clear why the OP is not getting by with this mistake, because newfs (for a UFS filesystem) doesn't write anything ahead of the superblock -- unless asked to install bootblocks.
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