Date: Mon, 22 May 2023 21:51:40 -0600 From: Warner Losh <imp@bsdimp.com> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: gpart destroy efi partition? Message-ID: <CANCZdfrPwX=1SXnqu4_i0cyt-R38KH8_Jt97PDjRqci0cOXTAw@mail.gmail.com> In-Reply-To: <ZGw2tRM9edxKxXqO@troutmask.apl.washington.edu> References: <ZGw2tRM9edxKxXqO@troutmask.apl.washington.edu>
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[-- Attachment #1 --] On Mon, May 22, 2023, 9:45 PM Steve Kargl <sgk@troutmask.apl.washington.edu> wrote: > Is there a secret incantation for destroying an EFI > partition on a USB memstick? After installing FreeBSD, > I would like to re-use a memstick, but > > % gpart destroy da0 > gpart: geom 'da0': Read-only file system > % gpart destroy -F da0 > gpart: geom 'da0': Read-only file system > % gpart show da0 > => 40 60063664 da0 GPT (29G) > 40 60063664 1 ms-basic-data (29G) > % gpart delete -i 1 da0 > gpart: geom 'da0': Read-only file system > % dd if=/dev/zero of=/dev/da0 bs=1m > dd: /dev/da0: Read-only file system > What's mounted? Warner -- > Steve > > [-- Attachment #2 --] <div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 22, 2023, 9:45 PM Steve Kargl <<a href="mailto:sgk@troutmask.apl.washington.edu">sgk@troutmask.apl.washington.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Is there a secret incantation for destroying an EFI<br> partition on a USB memstick? After installing FreeBSD,<br> I would like to re-use a memstick, but<br> <br> % gpart destroy da0<br> gpart: geom 'da0': Read-only file system<br> % gpart destroy -F da0<br> gpart: geom 'da0': Read-only file system<br> % gpart show da0<br> => 40 60063664 da0 GPT (29G)<br> 40 60063664 1 ms-basic-data (29G)<br> % gpart delete -i 1 da0<br> gpart: geom 'da0': Read-only file system<br> % dd if=/dev/zero of=/dev/da0 bs=1m<br> dd: /dev/da0: Read-only file system<br></blockquote></div></div><div dir="auto"><br></div><div dir="auto">What's mounted?</div><div dir="auto"><br></div><div dir="auto">Warner </div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> -- <br> Steve<br> <br> </blockquote></div></div></div>
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