I'm wondering that who's email client is broken, yours or mine? I'm seeing a
lot of U+FFFD replacement characters in this email, like, behind every stop
punctuation ("?", ".", and ")"), but not in your other emails on the list.Regards, -- Pengcheng Xu https://jsteward.moe > -----Original Message----- > From: Dale <rdalek1...@gmail.com> > Sent: Thursday, June 18, 2020 5:14 PM > To: gentoo-user@lists.gentoo.org > Subject: Re: [gentoo-user] Testing a used hard drive to make SURE it is good. > > David Haller wrote: > > > Hello, > > On Mon, 15 Jun 2020, Dale wrote: > [..] > > While I'm at it, when running dd, I have zero and random in > /dev.� > Where > does a person obtain a one?� In other words, I can write all > zeros, > I > can write all random but I can't write all ones since it isn't > in /dev.� > Does that even exist?� Can I create it myself somehow?� Can I > download > it or install it somehow?� I been curious about that for a good > long > while now.� I just never remember to ask.� > > > I've wondered that too. So I just hacked one up just now. > > ==== ones.c ==== > #include <unistd.h> > #include <stdlib.h> > #include <stdio.h> > static unsigned int buf[BUFSIZ]; > int main(void) { > unsigned int i; > for(i = 0; i < BUFSIZ; i++) { buf[i] = (unsigned int)-1; } > while( write(STDOUT_FILENO, buf, sizeof(buf)) ); > exit(0); > } > ==== > > Compile with: > gcc $CFLAGS -o ones ones.c > or > gcc $(portageq envvar CFLAGS) -o ones ones.c > > and use/test e.g. like > > ./ones | dd of=/dev/null bs=8M count=1000 iflag=fullblock > > Here, it's about as fast as > > cat /dev/zero | dd of=/dev/null bs=8M count=1000 iflag=fullblock > > (but only about ~25% as fast as > dd if=/dev/zero of=/dev/null bs=8M count=1000 iflag=fullblock > for whatever reason ever, but the implementation of /dev/zero is > non-trivial ...) > > HTH, > -dnh > > > > I got it to compile, at least it created a file named ones anyway.� What I'm > unclear about, where is the if= for dd in the command?� All the commands I've > seen before has a if= and a of=.� The if for input and of for output or > target.� > I'm assuming that if I want to target sdb, I'd replace null with /dev/sdb.� > > As I've posted before, even my scripting skills are minimal.� Surprised I got > it to compile even.� lol� Just trying to make sure I don't mess up something.� > I placed all this in the /root directory.� I'm assuming I can copy paste the > commands above while in /root to make it work?� I'm asking because I haven't > tried it yet.� > > Thanks. > > Dale > > :-)� :-)� > >
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