Date: Tue, 11 Apr 2023 16:32:47 +0300 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: Graham Perrin <grahamperrin@FreeBSD.org> Cc: freebsd-hackers@FreeBSD.org Subject: Re: gpart destroy, in depth Message-ID: <alpine.BSF.2.00.2304111630560.32077@woozle.rinet.ru> In-Reply-To: <64e88636-1e03-7ff5-7d3f-e8a36117cdbe@freebsd.org> References: <64e88636-1e03-7ff5-7d3f-e8a36117cdbe@freebsd.org>
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On Tue, 11 Apr 2023, Graham Perrin wrote: > Please: what, exactly, occurs when a partition table is destroyed by gpart(8)? > > Background: a customer was 100% certain that no data was required from a hard > disk in an iMac that will be disposed of. I booted from a USB drive with > FreeBSD 14.0-CURRENT, then lazily ran gpart destroy for the internal disk > (probably ada0). A few hours later, the customer realised that the disk > probably held a few years' worth of important emails. > > I don't intend to attempt recovery, or recreation of the partition table, but > I'd like to provide enough technical information for a third party to advise > the customer whether doing so will be economically viable. > > (I see files such as lib/geom/part/geom_part.c and sys/geom/part/g_part.c, but > I have no idea how to interpret them.) > > Thanks > > <https://github.com/freebsd/freebsd-src/blob/main/lib/geom/part/geom_part.c>; > > <https://github.com/freebsd/freebsd-src/blob/main/sys/geom/part/g_part.c>; I suppose sysutils/testdisk will be useful for recovering, as most of actual file systems are left intact -- Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] [ FreeBSD committer: marck@FreeBSD.org ] --------------------------------------------------------------------------- *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- woozle@woozle.net *** ---------------------------------------------------------------------------
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