Date: Thu, 18 Aug 2016 22:21:34 -0600 From: Warner Losh <imp@bsdimp.com> To: "Julian H. Stacey" <jhs@berklix.com> Cc: "Jukka A. Ukkonen" <jau789@gmail.com>, freebsd-fs@freebsd.org, freebsd-advocacy@freebsd.org Subject: Re: A how-to guide which you might wish to use for freebsd advocacy Message-ID: <CANCZdfrKy%2BwdvFZSJxxhe1xStGsBzgJcR6icPLW-h1eOi0impQ@mail.gmail.com> In-Reply-To: <201608182258.u7IMvpT5090433@fire.js.berklix.net> References: <71a9ed60-90c1-9df3-4da0-cafd23e48fc0@gmail.com> <201608182258.u7IMvpT5090433@fire.js.berklix.net>
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On Thu, Aug 18, 2016 at 4:57 PM, Julian H. Stacey <jhs@berklix.com> wrote: > "Jukka A. Ukkonen" wrote freebsd-advocacy@freebsd.org: >> >> https://www.facebook.com/notes/jukka-ukkonen/upgrading-the-storage-disk-to-finnsat-fh05-hdr-digital-tv-receiver-while-retaini/10208639116987804 >> >> Feel free to publish the link on the freebsd web site or otherwise >> distribute it further. > > I added cc: freebsd-fs@freebsd.org as it's about file systems & Ext2 & offsets. > > (BTW I have no facebook login, so can assure readers Jukka's > page is public, no fbook login needed to access URL) > > An extract re FS. > > ] FreeBSD will by default not accept the Finnsat generated partition > ] for mounting. The trick is that Finnsat creates partitions with > ] slack alignment. FreeBSD knows that a live ext2fs has to be a > ] multiple of 4kB, 4096 bytes in size, i.e. 8 disk blocks, 8*512 > ] bytes. If the partition size is not perfectly aligned, FreeBSD does > ] not allow read-write mount to an ext2fs instance. With all likelihood > ] it might be a broken file system. Why should FreeBSD help making > ] things worse? > ] > ] So, you will have to adjust the partition size such that its length > ] will be a multiple of 8 disk blocks. The tool for this is gpart > ] (geom partition) which both modifies the partition tables and shows > ] their contents. First use the command > > Thanks Jukka, > > I've bcc'd a friend who I discussed Humax TV recorders with a while > back, on similar issues, some time when I'm visiting the town where > my 3 Humax owner friends are, I hope to find time to experiment > with my USB to SATA converter. > > This thread is archived here: > http://lists.freebsd.org/pipermail/freebsd-advocacy/2016-August/004619.html > & under here: > http://lists.freebsd.org/pipermail/freebsd-fs/2016-August/date.html This has been a problem for a while. gpart is too smart. It won't allow one to create unaligned partitions, even when you know they will work. Warner
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