Date: Mon, 1 May 2006 21:21:26 -0400 From: "Jim Stapleton" <stapleton.41@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: dd issues Message-ID: <80f4f2b20605011821v5e6a51c2i458af940512cf42@mail.gmail.com> In-Reply-To: <80f4f2b20605011820w314d8852t231e65bfebf5f6e6@mail.gmail.com> References: <80f4f2b20605011644r87563a0r9141d4a62a28b98b@mail.gmail.com> <20060502000409.GZ81777@wantadilla.lemis.com> <80f4f2b20605011820w314d8852t231e65bfebf5f6e6@mail.gmail.com>
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On 5/1/06, Greg 'groggy' Lehey <grog@freebsd.org> wrote: > On Monday, 1 May 2006 at 19:44:00 -0400, Jim Stapleton wrote: > > I'm trying to back up some of my software, and I'm having some > > problems, I found something in the archives specifying the need to set > > a block size of 2k or greater. This makes a backup (I've not tested it > > yet). > > > > My questions are: > > (1) Why does this work? > > Why shouldn't it? Because the alternative does not work (default block size, block size less than 2k). > > > (2) Is it possible that not using the default/found block size will > > cause issues? > > Yes. > > Without more background in what you're trying to do (you don't even > say what backup program or what medium you're trying to back up to), > or what your concerns are, it's difficult to answer this question. > There are no specific issues with block size on most archivers, but in > general large block sizes (64 kB or larger) will give better > performance. program is dd, source medium is CD, destination medium is hard drive. Possible later medium is compressed files on HD DVD-RW
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